What was found
DURING T/O ROLL, THE FIRE DETECTION LIGHT AND FIRE WARNING LIGHT ILLUMINATED ON NR 1 ENG. THE NR 1 ENG NACELLE OVERHEAT TEMP REACHED 9, THEN QUICKLY DROPPED TO ZERO. ABORTED T/O AT 60 KNOTS AND RETURNED TO RAMP. FOUND REVERSER DUCT CLAMP BLOWN. REMOVED AND REPLACED CLAMP, INSPECTED ENG AND PERFORMED GND ENG RUN. LK AND OPS CK GOOD.