As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON INITIAL CARGO FIRE TEST AFT ARM LIGHT FAILED TO ILLUMINATE AND DETECTOR FAULT ILLUMINATED. WHILE ISOLATING LOOPS SUBSEQUENT TESTS OK. REMOVED AFT ARM LIGHT AND CLEANED CONTACTS RESET C/B AND PERFORMED GOOD FUNCTIONAL CHECK IAW AMM 26 16 00 710 801.