As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATIVE BRAKE FAULT AND BRAKES NORTH WINGSTATION, MINOR FAULT. BRAKE SYSTEM CONTROL UNIT #2 CHANNEL SHOWS BRAKE ALTERNATIVE SERVICE VALVE, (98GG) AND ALTERNATIVE BRAKE CONTROL UNIT (95GG). MAINTENANCE ACCOMPLISHED FUNCTIONAL TEST OF THE ALTERNATIVE BRAKING AUTOMATICALLY FLIGHT SIMULATED PER MM 32-43-00-710-002A. AIRCRAFT WAS GROUNDED