As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FROM RJTY AIRCRAFT YAWS TO THE RIGHT WHEN YAW DAMPER IS TURNED ON. THE AUTOPILOT RUDDER IS OFF SCALE RIGHT INDICE AUTOPILOT RUDDER OFF SCALE RIGHT. MAINTENANCE TROUBLESHOT AUTOPILOT SYSTEM AND FOUND YAW AND ROLL CHANNEL COMPUTERS WEAK. REMOVED AND REPLACED YAW CHANNEL AND ROLL COMPUTERS PER ALL APPLICABLE MANUALS AND THE OPERATIONAL CHECK WAS GOOD ON THE GROUND. AIRCRAFT WAS RETURNED TO SERVICE.