As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4425, DURING TAXI THE CREW REPORTED A PITCH TRIM RUNAWAY FOLLOWED BY PITCH TRIM F/O SWITCH FAIL MESSAGE. THE AIRCRAFT RETURNED TO THE GATE WHERE MAINTENANCE REMOVED AND REPLACED THE F/O'S PITCH TRIM SWITCH, OPERATIONALLY TESTED AITH NO DEFECTS AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.