As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ON FINAL APPROACH TO MIA, THE LOWER AFT CARGO COMPARTMENT FIRE WARNING LIGHT BECAME ILLUMINATED. THE NR 1 FIRE BOTTLE WAS DISCHARGED, THE LOWER AFT CARGO COMPARTMENT FIRE WARNING LIGHT WENT OUT. GROUND MAINTENANCE REMOVED AND REPLACED THE NR 1 FIRE BOTTLE IAW MM 26-7-00. SYSTEM OPERATIONALLY CHECKED NORMAL. NO EVIDENCE OF FIRE OR SMOKE IN LOWER AFT CARGO COMPARTMENT.