As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3336 THE CREW REPORTED THAT WHILE CLIMBING THROUGH FL300 AUTOPILOT FAILED (WARNING) FOLLOWED BY RUDDER SYS 1-2 INOP (CAUTION) FOLLOWED AOM PROCEDURE. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE RUDDER SYS 2 PRESSURE SWITCH IAW EMB MM 27-23-04. THE OPERATIONAL CHECK AND LEAK CHECK WERE OK. AUTO PILOT FUNCTIONAL TEST OK IAW EMB MM 22-11-00. THE AIRCRAFT WAS RETURNED TO SERVICE.