What was found
NR 1 NAC TEMP IN OVERHEAT RANGE 8.5A 8.5B MOMENTARY FIRE WARNING. SHUTDOWN IN ACCORDANCE WITH INFLIGHT ENGINE SHUTDOWN CHECK LIST. NO PARAMETERS EXCEEDED. WINDMILL FOR 40 MINUTES. TROUBLESHOT IAW FIM 26-11-00. PERFORMED PNEUMATIC LEAK CHECK IAW B747 AMM 71-00-00 TEST NR 1 FOUND START VALVE LEAKING EXCESSIVE AIR. REMOVED AND REPLACED START VALVE IAW B747 AMM 80-11-04. LEAK AND OPS CHECK GOOD. NACELLE TEMP OPS NORMAL AFTER FIXING AIR LEAK IAW B747 AMM 26-11-00. NO DEFECTS NOTED AT THIS TIME. PERFORMED ENGINE WINDMILLING INSPECTION IAW B747 AMM 72-00-00. ENGINE OK FOR CONTINUED SERVICE.