Of the info mentioning maintenance filling DASD, no mention of release, nor the current level Cumulative, but mention of TR implies at least v7r1?
And the stack is? I would expect likely a CQE query; seemed an all-too-typical symptom [an apparent hang]. A LIC process dump will include the LIC stack; a second dump taken some time later, >might expose changes [similar to F5=Refresh might in Work With Job (WRKJOB) for the Program Stack (*PGMSTK)].
Are there indexes awaiting rebuild or actively rebuilding, showing in Edit Rebuild Access Paths (EDTRBDAP)?