As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT ATB DUE TO LOWER AFT CARGO AND BULK CARGO COMPARTMENT FIRE WARNING INDICATION. PERFORMED TROUBLE SHOOTING PER MM 26-16-00 AND FOUND NR 4, NR 5 AND NR 6 SMOKE DETECTOR LAMPS AT FAULT. REMOVED AND REPLACED LAMPS AND PERFORMED SYSTEM TEST. ALL OPS OK. (M)