As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BNA INFLIGHT PIT-DFW CREW REPORTED FORWARD CARGO FIRE DETECTION WARNING INDICATION. DISCHARGED EXTINGUISHERS PER QRH PROCEDURES. EMERGENCY DECLARED FLIGHT DIVERTED BNA LANDED WITHOUT INCIDENT. CFR INVESTIGATION UPON LANDING HAD NO EVIDENCE OF FIRE. AIRCRAFT REMOVED FROM SERVICE. REPLACED FAULTY B1 AND B2 SMOKE DETECTORS AND NUMBERS 1 AND 2 CARGO FIRE BOTTLES. SYSTEM GROUND CHECK NORMAL OPERATION.