As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TRIM TESTED NORMALLY DURING PRE-FLIGHT CHECKS, HOWEVER ON PUSH BACK, FOLLOWING NR 1 ENGINE START. RUDDER TRIM INDICATOR SHOWED FULL RIGHT DEFLECTION AND WOULD NOT TRIM. MAINTENANCE REPLACED THE RUDDER TRIM ACTUATOR AND THE AIRCRAFT WAS SUBSEQUENTLY RELEASED FOR SERVICE.