As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON LANDING GEAR EXTENSION ON LANDING AT KPHX, ECAM - "WHEELS NOSE WHEEL STEERING FAULT". NO NOSE WHEEL STEERING. DECLARED EMERGENCY LANDING. REMOVED AND REPLACED NOSE WHEEL STEERING SERVO CONTROL VALVE AS PER AMM 32-51-51-000. OPS CHECK GOOD.