As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RUDDER TRIM FAILED TO TRIM IN LEFT DIRECTION. [SUP 06-06-07] DURING DESCENT STARTED TO WORK ERRATICALLY IN ONE DIRECTION. BY THE TIME IT ARRIVED AT GATE, IT OPERATED NORMALLY. REPLACED RUDDER TRIM ACTUATOR. ACCOMPLISHED INSPECTION OF RUDDER TRIM ACTUATOR INSTALLATION.