What was found
AFTER TAKE OFF, RECEIVED SIMUTIANOUS LT ENG OVERHEAT AND ENGINE FIRE, BOTH ON EICAS WITH MASTER WARNING AND AURAL WARNING. PERFORMED INSPECTION OF THE NR 1 ENGINE IAW MM 72-00-00. FOUND PLUG ON TCC VALVE LOOSE AND LEAKING OUT ONTO FIRE LOOP. SECURED THE LEAK AND CHECKED TCC VALVE, NO LEAKS NOTED IAW AMM 71-00-00. REPLACED THE LT OVERHEAT DETECTION WIRES IAW WD 26-11-12, & SWPM 20-10-11. PERFORMED LT ENGINE FIRE DETECTION OVERHEAT SYS TEST, TESTED OK IAW AMM 26-11-00.