What was found
CREW REPORTED THAT DURING CLIMB AT 22,000 FEET, RECEIVED AN AUTO-PILOT AILERON MISTRIM MESSAGE. THEN AT 27,000 FEET RECEIVED AN AUTO-PILOT FAIL MESSAGE. THE PILOT DISENGAGED THE AUTO-PILOT SYSTEM AND REPORTED HE COULD NOT MOVE THE AILERONS AND THAT THE AUTO-PILOT SYSTEM STILL HAD CONTROL OF THE AILERON SYSTEM. THE PILOT APPLIED FORCE TO THE CONTROLS AND FREED THE AILERON. RETURNED TO KSDF AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE ROLL TRIM ACTUATOR, THE AILERON SERVO MOTOR, AND THE AUTO-PILOT CONTROL MODULE. OPERATIONAL CHECKS OF THE AUTO-PILOT AND AILERON SYSTEMS WERE GOOD, AS WELL AS A SUCCESSFUL TEST FLIGHT. THERE HAVE BEEN NO FURTHER OCCURRENCES AT THIS TIME.