As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW CALLED SAYING THEY HAVE A COMPUTER ISSUE WITH RUDDER DEFLECTION NOTIFICATION ON GROUND DURING PREFLIGHT INSPECTION. DETERMINED THE POSITION TRANSMITTER FLEXIBLE COUPLER WAS UNSERVICEABLE. REPLACED THE FLEXIBLE COUPLER WITH NEW. OPS CHECKED GOOD.