As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: 30 MINUTES INTO FLIGHT, SMOOTH AIR AT 34000 RUDDER SUDDENLY MOVED RIGHT.9. FLIGHT CREW FELT THE YAW ON UNCOORDINATED FLIGHT, GRADUALLY THE RUDDER RETURNED TO NORMAL. THE FLIGHT CREW REPORTED THAT LATER ON DURING THE FLIGHT IT RE-OCCURRED FOR A SECOND TIME. MAINTENANCE REPLACED RUDDER TRIM ACTUATOR 10CC PER AMM 27-22-51. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 27-22-00.