What was found
DURING CLIMB-OUT OF MIA, RECEIVED FIRE WARNING ON NR 4 ENGINE AT APPROX 13000 FT DISCHARGED 1 FIRE EXTINGUISHER BOTTLE, WARNING DID NOT CEASE. DISCHARGED 2ND FIRE BOTTLE AND WARNING CEASED. RETURNED TO MIA AND LANDED WITHOUT INCIDENT. AFTER LANDING RECEIVED MOMENTARY FIRE WARNING AND BELL. F/O CHECKED ENGINE THROUGH WINDOW AND OBSERVED EVIDENCE OF FIRE ON NR 4 ENGINE. CREW EVACUATED AIRCRAFT AND FIRE DEPARTMENT EXTINGUISHED RESIDUAL FIRE ON NR 4 ENGINE. (M)