As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2217, DURING TAXI THE CREW REPORTED SEVERAL OUTBOARD BRAKE INOP MESSAGES ON EICAS. THE AIRCRAFT RETURNED TO THE GATE WHERE MAINTENANCE REMOVED AND REPLACED THE OUTBOARD BRAKE SHUT OFF VALVE, OPERATIONALLY CHECKED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.