As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ON APPROACH, RECEIVED A MAU2B FAIL MESSAGE ON EICAS AND A RT BRAKE FAULT. CREW FOLLOWED QRH PROCEDURES, DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT SYSTEM AND REMOVED AND REPLACED MAU POWER MODULE AND COMPLETED OPERATIONAL CHECK OF SYSTEM. ALL CHECKS, OPERATIONAL CHECKS WERE GOOD AND RETURNED A/C TO SERVICE.