As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH INTO GRB, FORWARD CARGO COMPARTMENT FIRE DETECTOR SOUNDED. FOLLOWED COM PROCEDURES AND EXTINGUISHING BOTTLE WAS DISCHARGED. LANDING WAS UNEVENTFUL. MAINTENANCE REPLACED CARGO SMOKE DETECTOR, ECU, AND BOTTLE. AIRCRAFT RETURNED TO SERVICE.