Look at the printer file QPJOBLOG. The OUTQ parameter may have been changed. Sometimes that happens when a new release is installed.
First, see this document on <a href=”http://www-01.ibm.com/support/docview.wss?uid=nas1527bb8e9027222da862573640046ef4d”>Job Logs, Job Dumps, and Service Dumps No Longer in QEZJOBLOG or QEZDEBUG Output Queue after Operating System Installation or Upgrade</a> for a general discussion.
But note that actions such as setting/enabling/disabling system cleanup options may also affect system printer file routing. See the GO CLEANUP command to review current settings.