As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUSE FLIGHT, A FIRE MAIN DECK AFT EICAS MESSAGE ILLUMINATED. CREW RETURNED N438GT TO ANC.<BR>(<P>EFFECTED SMOKE DETECTORS 11 AND 12 FOR ZONE 12 LOOP A AND ZONE 11 LOOP A WERE REMOVED, CLEANED AND REINSTALLED. OPERATION TEST AND SYSTEM TEST WERE PERFORMED. CHECKS GOOD AND MESSAGE CLEARED IAW AMM 26-14-01.</P>)