If you access CA 7 via ISPF and issue the /LOGOFF command and you get message:
Abend 13E000 hex occurred processing command 'CALL
Release : 11.3, 12.0, 12.1
Component : CA-7
This only occur on z/OS 2.4 systems and when logged on via ISPF
This problem is addressed by IBM apar OA58617
See link below:
https://www.ibm.com/support/pages/apar/OA58617