As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RUDDER CONTROL BECAME ERRATIC. *S/D* REPLACED THE RUDDER POWER CONTROL UNIT (PCU). ALSO, ACCOMPLISHED A CHECK OF THE FORCES REQUIRED TO MOVE THE STANDBY RUDDER ACTUATOR INPUT FORCES PER MM 27-21-00-101. INPUT FORCES WERE WITHIN LIMITS AND NO FAULTS WERE FOUND WITH THE PCU WHEN IT WAS TESTED IN THE COMPONENT REPAIR SHOP.