As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, COMPLETE LOSS OF NOSE WHEEL STEERING AND BRAKING. ALSO EXPERIENCED UNCOMMANDED LEFT TURN. BRAKE SYSTEM CONTROL UNIT (BSCU) FAILED. BRAKE SYSTEM CONTROL UNIT (BSCU) REPLACED, NOSE WHEEL ANTISKID STEERING SWITCH REPLACED. OPERATIONS CHECK NORMAL.