As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL, THE NR 3 ENGINE N1 INDICATION SPIKED WHILE AT MAXIMUM POWER. THE TAKEOFF WAS ABORTED AT APPROXIMATELY 40 KNOTS. ALL OTHER PARAMETERS WERE NORMAL. THE AIRCRAFT RETURNED TO THE GATE WHERE MAINTENANCE DEFERRED THE N1 INDICATION UNDER MEL 77-1B. EXACT PART CAUSING PROBLEM TO BE DETERMINED.