As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LANDING FLARE, AILERONS BECAME EXTREMELY STIFF ALMOST AS THOUGH AUTO PILOT WAS STILL ENGAGED. PRESSING CAPTS A/P TRIM DISC HAD NO EFFECT. STIFFNESS CAUSED ROLL OSCILLATION. STIFFNESS BROKE LOOSE BY MOVING AILERONS AFTER LANDING AND FELT LIKE A/P DISCONNECTED. REPLACED AUTO PILOT AILERON SERVO. OPS CHECKS GOOD.