What was found
AIRCRAFT WAS GROUNDED: ON TAKEOFF, WHEN THRUST LEVERS WERE PLACED IN FLEX DETENT, THERE WAS A SIGNIFICANT DIFFERENCE IN ENGINE EPR. #1 EPR, WE BELIEVE ACHIEVED APPROX. 1.4, WHILE #2 ACHIEVED APPROX..1.2. REJECTED TAKEOFF APPROX. 70 KNOTS. REMOVED AND REPLACED RIGHT ENGINE. ACCOMPLISHED RIGHT ENGINE POWER RUNS AND LEAKED CHECK IAW AMM 73-22-51 AND JOB CARDS 26L40071004, 26L00071015, NO DEFECTS NOTED.