As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT FOR TAKEOFF DURING FLIGHT CONTROL CHECK, RIGHT AILERON BECAME STUCK IN FULL UP POSITION. RETURNED TO BLOCK, FOUND RT INBOARD PCA INPUT LEVER RESTRICTED. REPLACED UNIT, OPERATION NORMAL. SHOP INSPECTION OF PCA FOUND SPRING (P/N 1527725) MISSING. THIS ALLOWED THE WASHER (P/N 1527729) TO FALL OUT OF POSITION AND JAM THE SLIDE ASSEMBLY (P/N 1527721).