As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PSP - INFLIGHT DURING DESCENT WARNING SOUNDED INDICATING FIRE IN AFT CARGO. BOTTLES DISCHARGED. LANDED PSP WITHOUT INCIDENT. NO FIRE. FOUND CARGO ELECTRONIC UNIT IN AFT CARGO COMPARTMENT CAUSING FIRE WARNING. REPLACED CARGO ELECTRONIC UNIT AND REPLACED CARGO SUPPRESSION SYSTEM FIRE BOTTLES. SYSTEM GROUND CHECKED NORMAL OPERATION.