As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A VIBRATION IN THE CONTROLS & IN THE FLOOR, NOTICEABLE IN SMOOTH AIR IN CRUISE AT FL 400. AT LOWER ALTITUDES VIBRATION GOES AWAY. FOUND ELEVATOR TRIM TABS LOOSE DUE TO WORN PUSHRODS & HARDWARE AT TRIM TAB ACTUATOR. R & R LT & RT ELEVATOR TRIM TAB INNER & OUTER PUSHRODS IAW MM 27-32-03. RIGGED LT & RT TRIM TABS. LUBRICATED LT & RT TRIM TAB ACTUATORS. TRAVEL CHECKS SATISFACTORY IAW MM 27-31-00.