As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RUDDER TRIM RUNAWAY OCCURED IN FLIGHT. AUTOPILOT WAS ENGAGED, AIRCRAFT YAWED, TRIM INDICATION WAS MOVING RAPIDLY LEFT. PHASE OF FLIGHT WAS CLIMB ATTITUDE AND TRIM WAS NOT BEING USED AT THE TIME. IAW EMERGENCY CHECKLIST, CIRCUIT BREAKER FOR RUDDER TRIM ACTUATOR WAS PULLED. LANDING UNEVENTFUL. INTEROGATED CDS, NO FAULTS PERTAINING TO ATA 22 OR 27. R & R AILERON AND RUDDER TRIM CONTROL PANEL IAW MM 27-13-16-000-801 + 27-13-16-400-801 AS A PRECAUTIONARY MEASURE. OPS TEST OF AILERON AND RUDDER CONTROL SYSTEM GOOD. NO DEFECTS NOTED. RETURNED TO SERVICE.