As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2447 - STL - FLIGHT CREW REPORTED THAT UPON LANDING, ACFT EXPERIENCED AN ABRUPT UNCOMMANDED TURN TO THE RIGHT SIDE. IMMEDIATELY CREW PRESSED STEERING DISCONNECT TRIGGER AND BROUGHT ACFT TO STOP. CREW WAS UNABLE TO USE TILLER NOR CLEAN STEERING INOP MESSAGE ON EICAS. EWR MX REMOVED AND REPLACED FEEDBACK POTENTIOMETER AND STEERING MANIFOLD AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.