As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT RECEIVED MAIN CARGO SMOKE ALARM IN SECTION NR 3 COMPLIED WITH RED TABS AND LIGHT EXTINGUISHED. A/C RECEIVED INTO GATE NO FIRE OR SMOKE NOTED AT ARRIVAL. INSPECTED MAIN CARGO DECK SECTION NR 3, NO INDICATION OF FIRE ANYWHERE. DEMI CAN AYY 5070 HAD APPX 180 LBS OF DRY ICE FOR MEDICAL EQUIPMENT AT SECTION NR 3 RT. PERFORMED MC SMOKE DETECTION SYS ADJ/TEST PER MM 26-16-001-5, OP'S CHECKS NORMAL. REMOVED AND REPLACED NR 3 SMOKE DETECTOR AS A PRECAUTIONARY PER MM 26-16-001-4, SYS OPS CHECKS NORMAL PER MM 26-16-001-5.