As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) INTERMITTENT VIBRATIONS WERE FELT THROUGH AIRFRAME DURING A FUNCTION CHECK OF THE HYDRAULICS. UPON INSPECTION OF THE T/R SERVO THE HARDWARE AND BUSHING WERE FOUND TO BE WORN. THIS CAUSED A FLUTTERING OF THE INPUT VALVE WHICH WAS FELT THROUGH THE AIRFRAME. THE SERVO WAS REPLACED WITH A TSO 0.0 SERVO AND THE ACFT WAS RETURNED TO SERVICE.