As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATION IN AIRFRAME. MOST NOTABLE AT HIGHER SPEEDS-290K. NOT NOTICEABLE AT SPEEDS LESS THAN 240K. NO CHANGES WITH CONFIGURATION CHANGE. VIBRATION FELT THROUGHOUT AIRFRAME, AUTOPILOT ON AND OFF. R & R ELEVATOR, LT TRIM TAB HORN BEARINGS AND REPLACED RUDDER TRIM TAB HORN BEARINGS IAW MM 20-10-08.