As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED NOSE WHEEL STEERING FAULT. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DEPARTURE AND LANDED WITHOUT FURTHER INCIDENT AND AIRCRAFT WAS GROUNDED. REPLACED THE NOSE WHEEL STEERING SERVO CONTROL 6GC AND THE NOSE WHEEL STEEERING FEED BACK SENSOR 4GC.