What was found
RMS/FRU - REJECTED TAKEOFF, ON TAKEOFF ROLL, NR 1 ENGINE WOULD PRODUCE ONLY 108.0 N1 WITH FIREWALL THRUST. 113.0 N1 WAS THE DESIRED POWER SETTING. ABORTED TAKEOFF AT 80 KTS, NR 1 N1 APPEARED TO SPIN UP SLOWER THAN THE REST. ALL OTHER ENGINES APPEARED NORMAL. REMOVED AND REPLACED NR 1 ENGINE MEC PER MM 73-21-01. OP AND LEAK CHECKS OK. OK FOR SERVICE. REMOVED AND REPLACED NR 1 ENGINE FUEL PUMP PER MM 73-11-01. OPS AND LEAK CHECKS OK. OK FOR SERVICE. FUEL PUMP P/N 9039M45P14. (M)