As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING FLIGHT NOSE WHEEL STEERING FAULT MESSAGE OCCURRED. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED AT PHX AND THE AIRCRAFT WAS TOWED TO THE GATE. REPLACED THE BRAKE STERRING CONTROL UNIT ANDACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 32-42-34.