As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) "DURING FLIGHT CONTROL CHECK, SIGNIFICANT RESISTANCE WAS FELT IN ROLL CONTROL ALONG WITH A SOUND SIMILAR TO A MOTOR BEING FORCED. AFTER SEVERAL ATTEMPTS THE RESISTANCE RELEASED AND A CLINK WAS HEARD. AUTO PILOT WAS NOT ENGAGED DURING THIS CHECK" MX REPLACED THE AP ROLL SERVO DUE TO SUSPECT THE SERVO CLUTCH DID NOT DISENGAGE. PROBLEM WAS DUPLICATED, MOTOR WAS FOUND SEIZED.