The following message appeared after IPL which included starting OAM and CA1
CBR3615E Tape entry processing discontinued due to an installation exit (CBRUXENT) failure.
the CBRUXENT exit was disabled
Release : 14.0
Component : CA 1 Tape Management
CBRUXENT was enabled using "LI R,CBRUXENT"
See the following link for more information on reenabling the IBM OAM exits