As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
N THE BLOCKS WE GOT AFT CARGO SMOKE DETECTION. REMOVED MAIN CARGO & RE-TESTED MAIN DECK CARGO SMOKE DETECTION, MAIN AFT SMOKE DETECTION TESTED NORMAL. SUSPECT CONDENSATION EMITTING FROM THE AMJ & AYY CANS. ORDERING SMOKE DETECTOR CONTROL UNIT. CREW STATED AFT MAIN DECK DETECTED SMOKE. REMOVED AND REPLACED MAIN DECK CARGO SMOKE DETECTION CONTROL UNIT REF AMM 26-19-34-04-09. OPERATIONAL CHECK SATISFACTORY AMM 26-19-00-05-09.