As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT THE FLIGHT CREW GOT AN EICAS MESSAGE, "BAG SMOKE". FLIGHT CREW DISCHARGED BOTH BAGGAGE COMPARTMENT FIRE BOTTLES. MAINTENANCE INSPECTED THE BAGGAGE COMPARTMENT AND FOUND NO EVIDENCE OF SMOKE OR FIRE. MAINTENANCE REMOVED AND REPLACED THE CARGO COMPARTMENT SMOKE DETECTOR AND BOTH FIRE BOTTLES. SYSTEM OPS CHECKED GOOD.