As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - FLT 901 - EN ROUTE MIA-EZE - AFTER TAKEOFF CREW RECEIVED NR 3 ENGINE FIRE WARNING. SHUT ENGINE DOWN, RETURNED MIA AND LANDED WITHOUT INCIDENT. REPLACED LOWER CASE LOOP 'A' DETECTOR AND FIRE DETECTION UNIT. NR 3 ENGINE WAS LEAK CHECKED TO CONFIRM NO DUCT LEAKS. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)