The question here it is
1. Did you stop the queue manager properly and upgraded.
The upgrade was done by another team, and I think they could have stopped and upgrade the qmgr properly.
2. Did ...
It is on SunOS 5.9. After upgrade from V5.3 to V6, I found error msgs on /var/mqm/errors.
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error msgs since 2008-02-06
02/07/08 22:12:31 - Process(1797 ...