As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2316 EWR FLIGHT CREW REPORTED RUDDER SYSTEM 1/2 INOP MSG ON EICAS. CREW PERFORMED AIR RETURN AND LANDED ACFT UNEVENTFUL. EWR MX R&R LT AND RT RUDDER PRESSURE SWITCH AND PERFORMED OPS CHECK SUCCESSFULLY. ACFT WAS APPROVED FOR RETURN TO SERVICE.