Did you wait 10 minutes after ENDJOB before trying ENDJOBABN?
A simple posting of WRKPTFGRP is a start on ptf levels.
User job or system job?
You're on 6.1 so I am going to go out on a limb here and guess that you 
are current on maintenance.  Anything that came even close to requiring an 
IPL I would be on the phone with IBM asking for resolution.
Don't even want to take that time because there's an angry mob outside 
your door with pitchforks and torches?  Then, at the minimum run
DSPJOB OUTPUT(*PRINT) JOB(...)
DSPJOBLOG JOB(...) OUTPUT(*PRINT)
STRSRVJOB JOB(...)
TRCJOB SET(*ON)
wait 2 minutes or so
TRCJOB SET(*OFF)
DMPJOB
     which for a session that I just signed on and ran the command 
generated a 3,668 page spool file
ENDSRVJOB
DSPPTF OUTPUT(*PRINT)
WRKPTFGRP <F6> to print
WRKACTJOB SBS(offending subsystem) OUTPUT(*PRINT)
WRKSYSSTS then F3 out of it (done only to start statistics)
WRKSYSSTS OUTPUT(*PRINT)
Write down the job name, user and number of the 5250 job which ran these 
commands.
Then after your IPL connect back in with iNav, go into printer output and 
use View to subset it to just that job you wrote down.  Drag these spool 
files into a folder on your PC.  Zip them all together.  Use the website 
to open a pmr and attach this zip file.
I still recommend calling IBM first because it may then be that a trip 
into SST to trace a few things may have been the ticket.
PMR website:
http://www.ibm.com/support/servicerequest
What PTF groups are out there
http://www-912.ibm.com/s_dir/sline003.NSF/GroupPTFs?OpenView&view=GroupPTFs
What cume is currently out?
http://www-912.ibm.com/s_dir/sline003.nsf/ALLPSPBYREL
Rob Berendt
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