As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: UPON LANDING GEAR EXTENSION A NOSE WHEEL STEERING FAULT MESSAGE WAS RECEIVED. FLIGHT CREW ACCOMPLISHED A GO AROUND AND DECLARED AN EMERGENCY. THE AIRCRAFT LANDED SAFELY AT DCA AND THE CREW DISCOVERED THAT THE NOSE WHEEL STEERING HAD FAILED BUT WERE ABLE TO CLEAR THE RUNWAY AND WERE TOWED TO THE GATE. MAINTENANCE REPLACED THE NOSE WHEEL STEERING SERVO CONTROL AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 32-51-51.