>The following messages and trace output were written into the MVS log.
 >Any advice about this internal error DBTXN077 ?

We reported this problem last July.  At that time, we had installed version
3.1.1.3 on two of our AIX backup servers, and were experiencing this
DBTXN077 abend regularly (ie. every couple of days).   We worked with IBM
ADSM support, and as a short-term fix, we disabled caching on our disk
storage pool.  We have not had the abend since.

I noticed late last week that fixtest version 3.1.2.16 (for AIX) is
available, and contains an emergency fix for APAR IX80737, which as Richard
Sims noted, relates to this problem.  You might check to see if a fix has
been released for the MVS server.

Good Luck,

Dennis Haas
IBM Global Services - St. Louis Mo.
E-mail: dhaas AT us.ibm DOT com