As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3230 - ATB - DUE TO AFT CARGO SMOKE INDICATION. CARGO FIRE EXTINGUISHER DISCHARGED BY CREW. SUSPECT SMOKE WAS CAUSED BY USE OF GSE EQUIPMENT NEAR THE CARGO DOOR PRIOR TO FLIGHT THAT RESULTED IN ACCUMULATION OF FUMES IN THE COMPARTMENT. CORRECTIVE ACTION: REPLACED CARGO FIRE EXTINGUISHER AND RETURNED TO SERVICE.