What was found
AT 2000 FT ON FINAL, AUTOPILOT OFF, MADE LT WING DOWN AILERON TRIM INPUT. AILERON TRIM CONTINUED TOWARDS FULL LT WING DOWN. PRESSED RT WING DOWN SIDE OF SWITCH, MOVEMENT STOPPED, THEN TRIMMED BACK TO LEVEL FLIGHT. LANDING UNEVENTFUL. COULD NOT DUPLICATE, NO CDS MESSAGES FOUND. AS A PRECAUTIONARY MEASURE R & R AILERON & RUDDER TRIM CONTROL PANEL IAW AMM TASK 27-13-16-000-801, 27-13-16-400-801. OPS TESTED GOOD, ACFT OK FOR CONTINUED SERVICE.