What was found
FCO - DURING CLIMB, NR 4 ENGINE, S/N 4275, NACELLE TEMPERATURE INDICATED HIGH. CHECKED ENGINE DUCTS FOR AIR LEAKS AND RUPTURES, NONE FOUND. REPLACED LOWER FORWARD AND LOWER AFT FIREWARNING LOOPS, MFG P/N 895397 AND 895398, RESPECTIVELY. PERFORMED FAN TIEDOWN CHECK, RAN ENGINE AT HIGH POWER FOR NINE MINUTES WHILE MONITORING NACELLE TEMPERATURE, ALL INDICATIONS NORMAL.