What was found
AT INDICATED AIRSPEEDS ABOVE 150 KIAS, THE AIRCRAFT DEVELOPED A ROLLING TENDANCY TO THE LEFT. ROLLING TENDENCY INCREACES WITH AIRSPEED AT CRUISE AIRSPEEDS. AIRCRAFT REQUIRES HALF AVAILABLE RWD AILERON TRIM TO MAINTAIN WINGS LEVEL. AT AIRSPEEDS LESS THAN 150KIAS WITH NEUTRAL TRIMS, NO ROLLING TENDANCY IS OBSERVED. AUTO PILOT DISENGAGED. REMOVED FROM SERVICE. PERFORMED AN AILERON CABLE TENSION ADJUSTMENT. PERFORMED AN OPS CHECK FLIGHT, CHECKED GOOD. COMPLETED FREEDOM OF MOVEMENT CHECK, ENSURED FULL TRAVEL AND VERIFIED PROPER DIRECTIONAL MOVEMENT, NO DEFECTS NOTED IAW GPM 9.2. RETURNED TO SERVICE.