What was found
SHORTLY AFTER LEVEL OF AT 39.0, NR 4 ENGINE FIRE WARNING LIGHT ILLUMINATED. BOTH A/B FIRE LOOPS INDICATED FIRE. ACCOMPLISHED EMERGENCY FIRE PROCEDURES. AIRCRAFT RETURNED TO MIA. FOUND NR 4 EDP AT FAULT. REMOVED AND REPLACED EDP P/N 6506606. OPS AND LEAK CHECK OK. ALSO, FOUND 8TH STAGE DUCT CLAMP LEAKING NEAR FIRE WARNING ELEMENT. REPLACED CLAMP, PERFORMED OPS AND LEAK CHECK. ALL OK. (M)