What was found
THE PILOT REPORTED THAT THE CONTROLS WHERE STIFF IN THE ROLL AXIS. THE AUTOPILOT WAS TURNED OFF AND THE C/B WAS CYCLED WITH NO CHANGE IN THE CONDITION. AFTER LANDING WITHOUT INCIDENT, TECHS ARRIVED AND TROUBLESHOT THE A/P SYSTEM. THEY DISCOVERED THE AILERON AUTOPILOT SERVO DRIVE CLUTCH WAS NOT FULLY DISENGAGING, CAUSING THE EXCESSIVE FORCE REQUIRED TO ROLL THE AIRCRAFT. AILERON AUTOPILOT SERVO DRIVE WAS REMOVED AND REPLACED. BOTH GROUND AND IN-FLIGHT OPERATIONAL CHECKS WERE PERFORMED WITH NO DEFECTS NOTED. (NM13200503639) (K)