diff --git a/all.sas b/all.sas
index 82e9cd8..3d00f66 100644
--- a/all.sas
+++ b/all.sas
@@ -10105,8 +10105,9 @@ filename &tempref clear;
   &prefix._INIT_NUM  /* initialisation time as numeric                        */
   &prefix._INIT_DTTM /* initialisation time in E8601DT26.6 format             */
   &prefix.WORK       /* avoid typing %sysfunc(pathname(work)) every time      */
+  &prefix.PROCESSMODE
+  &prefix._STPSRV_HEADER_LOC
 ;
-
 %let sasjs_prefix=&prefix;
 
 data _null_;
@@ -24525,6 +24526,198 @@ quit;
 %end;
 
 %mend mv_castabload;/**
+  @file mv_castabsave.sas
+  @brief Saves an in-memory CAS table back to persistent storage
+  @details Runs in SPRE against an active CAS session.  Accepts a
+    SAS libref, derives the CAS caslib and session UUID from
+    sashelp.vlibnam, locates the owning CAS server via the
+    casManagement REST API, then queries the table endpoint to
+    discover the original source file and saves back to that path.
+    CASUTIL infers the file type from the output file extension.
+
+    A CAS session must already be established by the caller, eg:
+
+        cas mysess;
+        libname mylib cas caslib=Public;
+        %mv_castabsave(lib=mylib, table=BASEBALL)
+
+  @param [in] lib=    SAS libref for the CAS caslib
+  @param [in] table=  Name of the in-memory CAS table to save
+  @param [in] mdebug= (0) Set to 1 to enable verbose logging:
+                        - echoes resolved parameters
+                        - prints HTTP response body
+                        - enables mprint/notes during PROC calls
+
+  <h4> SAS Macros </h4>
+  @li mf_getplatform.sas
+  @li mf_getuniquefileref.sas
+  @li mf_getuniquelibref.sas
+  @li mp_abort.sas
+
+**/
+
+%macro mv_castabsave(
+    lib=
+    ,table=
+    ,mdebug=0
+);
+
+%local _sysopts base_uri caslib uuid server
+      srcfile srccaslib fname1 libref1 ftmp i _svcount;
+%let _sysopts=%sysfunc(getoption(mprint)) %sysfunc(getoption(notes));
+
+/* ---- input validation -------------------------------------------------- */
+%mp_abort(
+  iftrue=("&lib"="" or "&table"=""),
+  msg=%str(lib= and table= are required)
+)
+
+%if &mdebug=1 %then %do;
+  %put &=lib;
+  %put &=table;
+  options mprint notes;
+%end;
+
+/* ---- derive caslib and session UUID from sashelp.vlibnam --------------- */
+data _null_;
+  set sashelp.vlibnam(
+    where=(libname="%upcase(&lib)"
+      and sysname in ("Caslib","Session UUID"))
+  );
+  if sysname="Caslib" then call symputx('caslib',sysvalue,'L');
+  else call symputx('uuid',sysvalue,'L');
+run;
+
+%mp_abort(
+  iftrue=("&caslib"=""),
+  msg=%str(&lib is not an assigned CAS libref)
+)
+
+%mp_abort(
+  iftrue=("&uuid"=""),
+  msg=%str(No session UUID found for libref &lib)
+)
+
+%if &mdebug=1 %then %do;
+  %put &=caslib;
+  %put &=uuid;
+%end;
+
+%let base_uri=%mf_getplatform(VIYARESTAPI);
+
+/* ---- get list of CAS servers ------------------------------------------- */
+%let fname1=%mf_getuniquefileref();
+%let libref1=%mf_getuniquelibref();
+
+proc http method='GET' out=&fname1 oauth_bearer=sas_services
+    url="&base_uri/casManagement/servers";
+run;
+
+%mp_abort(
+  iftrue=(&SYS_PROCHTTP_STATUS_CODE ne 200),
+  msg=%str(&SYS_PROCHTTP_STATUS_CODE &SYS_PROCHTTP_STATUS_PHRASE)
+)
+
+libname &libref1 JSON fileref=&fname1;
+
+data _null_;
+  set &libref1..items;
+  call symputx(cats('_sv_', _n_), name, 'L');
+  call symputx('_svcount', _n_, 'L');
+run;
+
+libname &libref1 clear;
+filename &fname1 clear;
+
+/* ---- find which server owns this session ------------------------------- */
+%do i=1 %to &_svcount;
+  %if "&server"="" %then %do;
+    %if &mdebug=1 %then %put checking server: &&_sv_&i;
+    %let ftmp=%mf_getuniquefileref();
+    proc http method='GET' out=&ftmp oauth_bearer=sas_services
+        url="&base_uri/casManagement/servers/&&_sv_&i/sessions/&uuid";
+    run;
+    %if &SYS_PROCHTTP_STATUS_CODE=200
+      %then %let server=&&_sv_&i;
+    filename &ftmp clear;
+  %end;
+%end;
+
+%mp_abort(
+  iftrue=("&server"=""),
+  msg=%str(Could not find owning server for CAS session &uuid)
+)
+
+%if &mdebug=1 %then %put &=server;
+
+/* ---- discover srcfile from REST endpoint ------------------------------- */
+%let fname1=%mf_getuniquefileref();
+%let libref1=%mf_getuniquelibref();
+
+proc http method='GET' out=&fname1 oauth_bearer=sas_services
+    url="&base_uri/casManagement/servers/&server/caslibs/&caslib/tables/&table";
+run;
+
+%if &mdebug=1 %then %do;
+  %put &=SYS_PROCHTTP_STATUS_CODE &=SYS_PROCHTTP_STATUS_PHRASE;
+  data _null_;
+    infile &fname1;
+    input;
+    putlog _infile_;
+  run;
+%end;
+
+%mp_abort(
+  iftrue=(&SYS_PROCHTTP_STATUS_CODE=404),
+  msg=%str(&caslib..&table not found - is it loaded in memory?)
+)
+%mp_abort(
+  iftrue=(&SYS_PROCHTTP_STATUS_CODE ne 200),
+  msg=%str(&SYS_PROCHTTP_STATUS_CODE &SYS_PROCHTTP_STATUS_PHRASE)
+)
+
+libname &libref1 JSON fileref=&fname1;
+
+data _null_;
+  set &libref1..tablereference;
+  call symputx('srcfile', sourceTableName, 'L');
+  call symputx('srccaslib', sourceCaslibName, 'L');
+  stop;
+run;
+
+libname &libref1 clear;
+filename &fname1 clear;
+
+%mp_abort(
+  iftrue=("&srcfile"="" or "&srccaslib"=""),
+  msg=%str(No sourceTableName/sourceCaslibName for &caslib..&table)
+)
+
+%if &mdebug=1 %then %put &=srcfile;
+
+/* ---- save to disk ------------------------------------------------------- */
+proc casutil;
+  save casdata="&table"
+      incaslib="&caslib"
+      casout="&srcfile"
+      outcaslib="&srccaslib"
+      replace;
+quit;
+
+%mp_abort(
+  iftrue=(&syscc ne 0),
+  msg=%str(Save failed for &caslib..&table)
+)
+
+%put NOTE: Table &caslib..&table saved to &srcfile;
+
+/* ---- restore options --------------------------------------------------- */
+%if &mdebug=1 %then %do;
+  options &_sysopts;
+%end;
+
+%mend mv_castabsave;
+/**
   @file
   @brief Creates a file in SAS Drive using the API method
   @details Creates a file in SAS Drive using the API interface.