What was found
(CAN) DURING TAKEOFF ROLL,THE NR 1 ENGINE EPR GAUGE JUMPED FROM TAKEOFF SETTING OF 2.07 TO 2.15, FUEL FLOW JUMPED FROM 6,000 POUNDS PER HOUR TO 8,500 POUNDS PER HOUR AND BACK AGAIN. TAKEOFF WAS REJECTED. THE ENGINE PRESSURE RATIO TRANSMITTER WAS REPLACED. THE PS3 FILTER AND THE FUEL CONTROL UNIT WATER TRAP WERE CLEANED AND THE PT2 LINE WAS TIGHTENED. THE ENGINE WAS GROUND RUN SERVICEABLE.