As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROLL SERVO SLIP CLUTCH TORQUE FUNCTIONAL CHECK ROLL SERVO FAILS TEST, MAKES AUDIBLE GRINDING NOISE AND YOKE WAS JERKING LEFT TO RIGHT DURING FUNCTIONAL CHECK. REMOVED ROLL SERVO SLIP CLUTCH AND FOUND WATER AND OIL MIXED WITHIN SERVO MOTOR AND MOUNT. THE CLUTCH RETAINING BOLT WAS SEVERELY CORRODED AND THE SLIP CLUTCH RETAINING BOLT HOLE ELONGATED DUE TO CORRODED BOLT. PART WAS REPLACED WITH A REPAIRED PART AND SENT TO VENDOR FOR REPAIR