As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L ENG EICAS VIB READS HIGH. HIGHEST READING 50 (X.X, RANGE 0.0 TO 5.0, ABNORMAL ON 767-322 IF ABOVE 4.0). EXCESSIVE VIBRATION NOT FELT IN AIRFRAME. CREW COMMENTS, IN CRUISE AT FL250 AND 310 KNOTS- .74MACH VIB CHANGES IN RELATION TO THROTTLE MOVEMENT. N1 VIBRATION READINGS ARE ERRATIC AND WENT HIGH. THERE HAS BEEN RECENT CREW GRIPE INDICATING NOTHING WAS FELT. REPLACED THE AVM COMPUTER AND SENSOR.