As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, LOWER CARGO AFT FIRE WARNING CAME ON, THE CREW DISCHARGED BOTH BOTTLES. THEY LANDED, WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED LOWER CARGO SMOKE DETECTOR, DIVERTER VALVE AND BOTH FIRE EXTINGUISHER BOTTLES. OPERATIONAL CHECK GOOD IAW MM 26.05. AIRCRAFT WAS RETURNED TO SERVICE.