As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS - A/C EN ROUTE FROM EWR TO TYS WHEN CREW GOT A MESSAGE OF RUDDER SYSTEM 1 AND 2 INOP IN FLIGHT. A/C LANDED SAFELY AND MAINTENANCE REMOVED AND REPLACED SYSTEM 1 AND SYSTEM 2 PRESSURE SWITCHES IAW AMM 27-23-001 AND OPS CHECKED GOOD. A/C WAS RELEASED TO SERVICE. (P/N 15793-101--S/N-1132)