As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO MIA DUE TO A NOSE WHEEL STEERING FAULT MESSAGE DISPLAYED DURING CRUISE. THE AIRCRAFT LANDED SAFELY AT MIA. MAINTENANCE REPLACED THE NOSE LANDING GEAR STEERING SERVO CONTROL PER AMM 32-51-51 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.