As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT ANNUAL INSPECTION, FOUND BACKUP STOP PIN ON PILOT SIDE CONTROL SPROCKET TO BE DAMAGED. FURTHER INVESTIGATION REVEALED THAT THE SPROCKET TOOTH LOCATED AT THE STOP PIN WAS BROKEN OUT OF THE SPROCKET. POSSIBLE CAUSE IS STRESS FRACTURE AT THE WELD OF THE STOP PIN. SPROCKET WAS REPLACED AND AILERON SYSTEM WAS RE-RIGGED IAW MM. (NE03200401111)