What was found
AIRCRAFT GROUNDED - ABORTED TAKEOFF - NO. 1 ENGINE WOULD NOT REACH TAKE-OFF THRUST (STALLED AT 85% N1). NO. 2 ENGINE AT FULL TAKE-OFF POWER (100.8% N1). ENGINE BLEED OFF, TAKEOFF AND LANDING PROCEDURE WITH APU ON - LOW SPEED REJECT AT 70 IAS. PERFORMED FIM 73-05-00-810-808-F00 ENGINE TAKEOFF THRUST LOW FAULT ISOLATION, ALL CHECKS NORMAL. REMOVED AND REPLACED NR 1 ENGINE FUEL FILTER PER JOB CARD 08L40072006, LEAK CHECK AND OPS CHECK NORMAL, OKAY FOR SERVICE.