As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DAY - FLT 0223 - EN ROUTE IND TO BWI, AIRCRAFT EXPERIENCED AN UNCOMMANDED LEFT FULL RUDDER TRIM. CREW DISCONNECTED THE AUTOPILOT AND YAW DAMPER WITH NO EFFECT. FLIGHT DIVERTED TO DAY AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE RUDDER TRIM INDICATOR, CONTROL MODULE, AND ACTUATOR. PROBLEM WAS CONFIRMED AS A BAD RUDDER TRIM SWITCH. (M)