As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REFERENCE AML 0099548-2 INTERMITTENT MAIN DECK FIRE MSG ANNOUNCED ONCE DURING FLIGHT- FALSE. AS A RESULT OF T/S ZONE 12 LOOP A SMOKE DETECTOR FAULT MSG LATCHED PRESENT LEG FAULT SO REPLACED ZONE 12 LOOP A1, A2, A3 SMOKE DETECTOR AND OPER TEST NML IAW AMM 26-14-01 & SSM 26-16-02. NO FURTHER ACTION REQUIRED