As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW RECEIVED 'AUTO BRAKE FAULT / BRAKES RELEASED' ECAM MESSAGE EN ROUTE TO GCM. CREW ELECTED TO DECLARE AN EMERGENCY AND RETURNED TO DEPARTURE. REMOVED AND REPLACED THE BRAKE/STEERING CONTROL UNIT. CONTROL UNIT SENT TO REPAIR VENDOR AND DECLARED 'NO FAULT FOUND'. AIRCRAFT HAS HAD ONE REPEAT BRAKE FAULT TO DATE WHICH WAS RESET WITH NO FURTHER ISSUES.