As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACT - FLT 3910 - CARGO FIRE WARNING CAME ON IN-FLIGHT AND CREW BLEW BOTTLE AND DIVERTED INTO ACT. AIRCRAFT LANDED SAFELY. INSPECTED CARGO BAY FOR EVIDENCE OF SMOKE OR FIRE. NONE FOUND. MEL'D CARGO BIN PER 26-04. DFW UNABLE TO DUPLICATE WARNING. REPLACED FIRE BOTTLE AND THE 2 CARGO BIN SMOKE DETECTORS AS PRECAUTIONARY. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (X)