As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERENCY WAS DECLARED COMING INTO PHX DUE TO A NOSE WHEEL STEERING FAULT. THE AIRCRAFT LANDED SAFELY AND TAXIED TO THE GATE WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE BRAKE STEERING CONTROL UNIT (BSCU) PER AMM 32-42-34. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.