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 DFW; WHERE IT LANDED WITHOUT FURTHER INCIDENT AND TOWED TO GATE. AIRCRAFT WAS GROUNDED. REMOVED AND REPLACED NOSE WHEEL STEERING SERVO- CONTROL (6GC) AND THE NOSE WHEEL STEEERING FEED BACK SENSOR 4GC.