As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - FLT 5611 - CARGO SMOKE WARNING ILLUMINATED ON CWP. DISCHARGED ONE FIRE EXTINGUISHER. RETURNED TO FIELD. VERIFIED EVENT AS A FALSE WARNING. REMOVED AND REPLACED BOTH CARGO SMOKE DETECTORS AND FIRE EXTINGUISHER. PERFORMED THE WIRING CHECK. AIRCRAFT RETURNED TO SERVICE. REF: OPER CNTRL NR SIMA991911.