As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AFT CARGO DOOR CANNON MESSAGE WITH PROXY SYSTEM 2 FAULT ON DESCENT (4000 FEET). MAINTENANCE CYCLED AFT CARGO DOOR AND PROXY SYSTEM FAULT 2 MESSAGE CLEARDED. OPERATIONAL CHECKS OF THE PROXY SYSTEM WERE PERFORMED. OPS CHECKS NORMAL. AIRCRAFT WAS RELEASED FOR SERVICE.