What was found
NR 1 ENG EGT ON START AND AFTER START VERY ERRATIC TEMP SWINGS. ENG WAS RUNNING 5 MINUTES AND APPEARED TO BE GETTING HIGHER TEMP SWINGS 425 DEG TO 780 DEG FOUND FLEX DUCT FOR HPTACC TORN. PERFORMED TEMP REPAIR ON DUCT PER ECRA 7200-03038 REV A & RAN ENG AT IDLE W/ALL INDICATIONS NORMAL. INITIATED DIP FOR PERMANENT REPAIR (REPLACE) W/IN 2 CYCLES. REMOVED AND REPLACED DAMAGED COOLING AIR DUCT AS PER ESM 72-00-0 2-401-810