As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT CREW REPORTS FAULT LIGHT ILLUMINATED ON AFT CARGO FIRE DETECTION TEST. GROUNDED - YES. PERFORMED FIRE AND OVERHEAT DETECTION CHECK REF AMM 26-10-00-710-801, NO FAULTS FOUND. PERFORMED CARGO FIRE CONTROL PANEL BITE CHECK, NO FAULTS FOUND REF FIM 26-23 TASK 801.