As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DET ZONE 1 CARGO AFT AFT CARGO COMPARTMENT SMOKE DETECTOR ZONE FAILURE. ZONE 1,2 AND 3. RESET C/B NO HELP IAW FIM GROUND TEST, NO HELP. LOWER CARGO COMP SMOKE DETECTION CHANNEL 1 FWD FAILED MSG 26-20021 DF IAW MEL. COMPLY WITH MEL 2616P. REPLACED DETECTOR.