As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, CREW RECEIVED A MESSAGE FOR BRAKE DEGRADE ON THE EICAS WITH THE OUTBOARD BRAKE TEMPERATURE SIGNIFICANTLY ELEVATED OVER INBOARD BRAKES. AIRCRAFT RETURNED TO THE GATE WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE OUTBOARD BRAKES CONTROL VALVE. SYSTEM OPERATIONAL AND TAXI TESTED GOOD. AIRCRAFT RETURNED TO SERVICE.