What was found
BOI - ON TAKEOFF AILERON YOKE INPUT REQUIRED 20 TO 30 DEGREE RIGHT AILERON FOR WINGS LEVEL. FUEL WAS BALANCED AND TRIMS WERE NORMAL. NEUTRAL AILERON YOKE WOULD PUT A/C IN 20 TO 30 DEGREE LEFT BANK AS SPEED INCREASED IN CLIMB AND CRUISE AILERON YOKE ANGLE TO THE RIGHT DECREASED DUE TO A/C SPEED BUT NEUTRAL AILERON ABOUT 5 DEGREE. RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. INSPECTED AILERONS SYSTEM FOUND NO OBVIOUS DEFECTS; REPLACED AILERON / RUDDER TRIM CONTROL PANEL PER AMM TASK 27-1316-00-801 AND TASK 27-13-16-400-801, OPS CHECKS NORMAL A/C OKD FOR CONTINUED SERVICE, ALSO VISUALLY VERIFIED. FUEL TO NOT BE AT AN IMBALANCE BY MECHANICAL VISUAL AND ELECTRONIC MEANS.