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Step 1: Look for JES2 Procedure: The JES2 Procedure can be found in the CPAC.PARMLIB dataset.
Step 2: The JES2 procedure contains the following PROCLIB members CPAC.PROCLIB, SYS1.PROCLIB, SYS1.IBM.PROCLIB, SYS1.CLIENTR.PROCLIB and CLIENT.PROCLIB
Step 3: Look for CLIENTPROD Procedure found in SYS1.CLIENTR.PROCLIB: The CLIENTPROD is invoking ACPPROD member that is found in CLIENTSYS.ISSI.CLIST
Step 4: The ACPPROD found in CLIENTSYS.ISSI.CLIST is invoking ALPROF member found in the CLIENTSYS.ISSI.CLIST dataset.
Step 5: The ALPROF member is invoking ISPF PANEL(ISR@PRIM) member that is present in CLIENTSYS.ZOS.TARGET.ISRPLIB
Step 6: Browse ISR@PRIM and do find on keyword VSAM. You should get %VSAMUTIL.
Step 7: The VSAMUTIL found in CLIENT.IVU27.CMDPROC invokes the VSMUAPPL found in the CLIENT.IVU27.CMDPROC dataset.
Step 8: Edit the VSMUAPPL to set the new password SET &VSPW1 = RZFS2DVBAN26UHKE