As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB, RIGHT RUDDER TRIM WAS USED MOMENTARILY, FOLLOWED BY UNCOMMANDED FULL RIGHT RUDDER TRIM ACTIVATION, AIRCRAFT WAS RETURNED TO TRIMMED CONDITION EASILY OPPOSITE RUDDER AND CORRECTED ALL TOGETHER WITH TRIM SWITCH. NORMAL FOR REMAINDER OF FLIGHT. REPLACED AILERON/RUDDER TRIM PANEL IN REFERENCE TO CRJ 200 MM ATA CHPT 27-00-00. OPERATIONAL CHECK GOOD.