As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5412. DURING CRUISE FLIGHT ABOVE 280 KNOTS, THE AIRCRAFT ENCOUNTERED UNCOMMANDED RUDDER MOVEMENTS.PERFORMED ON OPERATIONAL CHECK OF THE YAW DAMPER SYSTEM, INCLUDING SVL-4000 COMMAND AND FEED BACK TEST. DISCREPANCY COULD NOT BE DUPLICATED.