As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C REQUIRES RWD AILERON TRIM UNTIL FLAPS ARE EXTENDED FOR LANDING. THEN REQUIRING CONSIDERABLE LWD AILERON TRIM. YOKE WAS BINDING DURING ROLLS TO THE LT & RT IN THE LANDING CONFIGURATION. FLT 6378 COMPLETED DETAILED INSPECTION OF THE AILERON & AILERON AUTOPILOT MECHANICAL CONTROL PATH IAW AMM. COMPLETED FUNCTIONAL TEST OF THE FLAPS IAW AMM, NO DISCREPANCIES NOTED AT THIS TIME.