What was found
DURING CLIMB OUT AT 20,000FT, 290 KNOTS, AN UNCOMMANDED ROLL TO THE LEFT, THEN RIGHT, 20 DEGREES WITH SHUDDER & VIBRATION. HAPPENED AGAIN 5 MINUTES LATER. TURNED AUTOPILOT OFF AND CONTINUED FOR ANOTHER 10 SECS. DIVERTED BACK TO DEPARTURE WITH NO FUTHER ISSUES, ENGINE PARAMATERS NORMAL. PERFORMED A RUDDER DEFLECTION CHECK IAW AMM 27-20-00, CHECKED GOOD. PERFORMED GUIDANCE PANEL OPERATIONAL TEST IAW AMM 22-11-01-710-801-A. OPS TESTED GOOD. PERFORMED AILERON DEFLECTION CHECK IAW AMM 27-12-01, CHECKED GOOD. REMOVED RIG PIN IAW AMM 22-11-04. REMOVED AND REPLACED AILERON SERVO IAW AMM 22-11-04, AND PERFORMED AN OPS CHECK IAW 22-11-04-710-801-A, OPS CHECKED GOOD. AND ACCOMPLISHED DEFLECTION AND OPERATIONAL CHECKS WITH NO DISCREPANCIES FOUND OPS CHECKED GOOD. ACFT OK FOR RETURN TO SERVICE.