As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE VIBRATES AT 85 PERCENT N1 AND INCREASES AS PWR IS INCREASED TO T/O. VIB CAN BE DUP ON GROUND. VIB IS FELT IN NR 1 START LEVER AND COCKPIT FLOOR. NO VIB IS FELT IN ANY OTHER THROTTLE. *S/D* REMOVED AND REPLACED, SEE WORK CARD 71T0701-1.