As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INITIAL TAKEOFF ROLL, THE NR 1 ENGINE WOULD NOT REACH TAKEOFF POWER. N1 WOULD NOT ACCELERATE ABOVE 90 PERCENT WITH ALL OTHER INDICATIONS ALSO LOW. THE TAKEOFF WAS ABORTED AT 40 KTS. MAINTENANCE REPLACED THE MAIN ENGINE CONTROL (MEC). FOLLOW UP ENGINE WAS NORMAL WITH ENGINE REACHING FULL TAKEOFF POWER.