As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TWO PERMANENT PINS THAT HOLD THE SPUR GEAR TO THE ROTATING SHAFT OF THE TRIM TAB ACTUATOR HAD FALLEN OUT AND WENT MISSING. TRIM CONTROL WAS IMPOSSIBLE DUE TO SLIPPAGE OF THE SPUR GEAR IN THE SHAFT. ACTUATOR REPLACED WITH NEWLY OVERHAULED UNIT.