What was found
AT FL380 AUTO PILOT KICKED OFF SEVERAL TIMES THEN FAILED. HAND FLYING THE AILERONS WERE STICKING. FLYING AT FL280 AFTER APPROXIMATELY 1 HOUR THE AILERONS STOPPED STICKING & THE AUTOPILOT RESET. APPLIED POWER TO THE AIRCRAFT & PERFORMED FREEDOM OF MOVEMENT CHECKS, NO DEFECTS NOTED. ENGAGED AUTO PILOT & PERFORMED OPERATIONAL CHECKS, NO DEFECTS NOTED. VISUALLY INSPECTED FLIGHT CONTROLS & MANUALLY OPERATION CHECKED FOR BINDING, NO DEFECTS NOTED. LUBRICATED FLIGHT CONTROLS & OPERATIONS CHECKED, NO DEFECTS NOTED IAW G-200 MM 22-10-00.