As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT RUDDER TRIM SYSTEM FAILED. SYSTEM RETUNED TO NORMAL ON LANDING. RUDDER TRIM STUCK, UNABLE TO MOVE IN EITHER DIRECTION. RAN TRIM UPON ARRIVAL, OPS NORMAL. ACCOMPLISHED TRIM ACTUATOR TEST PORTION MM. CYCLED CIRCUIT BREAKERS AND TAIL HYD SHUTOFF SWITCHES. RUDDER TRIM AGAIN OPS NORMAL.