As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT MAIN DECK CARGO SMOKE DETECTOR AND CARGO FIRE WARNING LIGHTS ILLUMINATED. NO APPARENT FIRE. COMPLETED CHECKLIST IAW QRH. PERFORMED MAIN DECK CARGO COMPARTMENT SMOKE DETECT SYSTEM TEST IAW AMM 26-14-00, NO FAULTS NOTED SMOKE DETECT SYSTEM TEST NORMAL IAW AMM 26-14-00.