As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN AILERON INPUT IS APPLIED A NULL AREA OF 10 DEGREES LEFT AND RIGHT IS DETECTED WITH NO ROLL RESPONSE. AILERON TRIM SET 1 UNIT RT, RUDDER 0. INSPECTED AILERON MOVEMENT, NO DEFECT NOTED AND CHECK LOST MOTION DEVICE, FOUND TO BE WITHIN LIMITS PER MM 22-61-51.