As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GLA INFLIGHT T137/03MAR LHR TO LAX - CREW REPORTED CARGO FIRE AFT EICAS AND FIRE WARNING LIGHT. FIRE BOTTLES WERE DISCHARGED AND FLIGHT DIVERTED TO GLA AND LANDED WITHOUT INCIDENT. NO EVIDENCE OF FIRE OR SMOKE FOUND. REPLACED AFT CARGO SMOKE DETECTOR AND REPLACED FIRE EXTINGUISHER BOTTLES. SYSTEM GROUND CHECKED NORMAL OPERATION.