As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT AFT CARGO FIRE WARING LIGHT ILLUMINATED WITH INTERMITTENT BELL. CREW FOLLOWED HARD CARD AND DISCHARGED NR 1 BOTTLE IAW POM. FOUND BAGS WET AND SMALL AMOUNT OF WATER ON FLOOR. NO EVIDENCE OF FIRE. SUSPECT WATER VAPOR SET OFF ALARM. REPLACED NR 1 BOTTLE. RAN TEST OF DET SYSTEM, CKS GOOD.