What was found
PILOT STATES THAT ON CLIMB OUT, AUTOPILOT DISCONNECTED AND A RED A/P TRIM INDICATION. PRESSED A/P TEST BUTTON, TESTED NORMAL. PRESSED A/P ENGAGE BUTTON, A/P DID NOT COME ON AND AIRCRAFT ROLLED HARD TO THE RIGHT. YOKE A/P TRIM DISCONNECTED BUTTON HELD DOWN, NO CHANGE. ALL THREE TRIM IN GREEN RANGE. PRESSED BOTH TRIM AND FLAP INTERRUPT BUTTONS, NO CHANGE. REDUCED POWER AND USED LEFT AILERON AS NEEDED TO COUNTER ACT, ROLL DECREASED AS AIRSPEED DECREASED. RETURNED TO KBFF, FLAPS UP LANDING. MAINTENANCE INSPECTED AND PERFORMED FUNCTION TEST ON THE FOLLOWING; AUTO PILOT SYSTEM, AILERON, AILERON TRIM, RUDDER, RUDDER TRIM, AND FLAPS. FOUND NO DISCREPANCIES. REMOVED AND REPLACED AUTO PILOT COMPUTER, ROLL SERVO, AND ROLL SERVO CLUTCH AS A PRECAUTIONARY. PERFORMED OPERATIONAL CH3ECK FLIGHT WITH SATISFACTORY RESULTS.