What was found
LGA - FLT 1470 - AT APPROXIMATELY V1, THE RIGHT ENGINE EPR DROPPED FROM 2.00 TO 1.70. AT ROTATION, GOT FIRE INDICATION BELL AND LIGHTS. AFTER REDUCING THROTTLE, THE FIRE INDICATION WENT OUT. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE HIGH PRESSURE PNEUMATIC SUPPLY DUCT. (X)