As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON APPLYING POWER AT T/O MAIN DECK SMOKE DETECTOR AFT B LOOP ILLUMINATED. LIGHT AND ECAM IMMEDIATELT WENT OFF WHEN T/O WAS ABORTED. ON SUBSEQUENT T/O LIGHT DID NOT ILLUMINATE AND THERE WAS NO ECAM ALERT. R & R MAIN DECK CARGO COMPARTMENT SMOKE DETECTION UNIT 15WU. IAW AMM 26-19-12-4. OPS CHECKED GOOD IAW AMM 26-19-00-5.