What was found
DURING TAKEOFF ROLL THE NR 1 ENG DID NOT DEVELOPE T/O POWER. TARGET N1 WAS 88.6 PERCENT BUT ONLY DEVELOPED 81 PERCENT N1. DOWNLOADED NR1 ENG. DCU AND SENT INFO TO MFG, SWAPPED EEC'S AND RAN FOR PWR OF DAY. DOWNLOADED DCU NR SENT TO MFG. PERFORMED OPS CHECK OF LT AND RT RVDT. OPS CHECK NORMAL. REMOVED AND REPLACED NR1 ENG FUEL CONTROL. RIGGED AND LEAK CHECKED. RAN NR1 ENG PWR OF THE DAY WAS NOT MET. DOWNLOADED DCU AND SENT TO MFG PERFORMED WIRING CHECKS ON CONNECTORS P1,P3, J1 AND PT009. WIRING CHECKS GOOD AT THIS TIME. RAN NR1 ENG FOR PWR OF DAY. PWR OF THE DAY WAS ACHIEVED. NR1 ENG PWR OF DAY OPS CHECK GOOD.