As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF CREW EXPERIENCED UNCOMMANDED YAW WITH ROLL. TURNED YAW DAMPER OFF AND OPENED C/B. THIS HAD NO EFFECT. CREW RETURNED TO BOEING FIELD AT TIME WITH FULL RUDDER DEFLECTION AND LANDED WITHOUT INCIDENT. AN INSPECTION IS ON GOING. WHEN MORE INFORMATION IS AVAILABLE IT WILL BE PROVIDED.