As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE EN ROUTE FROM DCA TO IND, CREW RECEIVED A NUMBER OF FAULT MESSAGES WHICH LEAD THEM TO BELIEVE THEY HAD NO BRAKES. CREW DECLARED AN EMERGENCY AND LANDED AT IND WITHOUT INCIDENT AND WITH BRAKES WORKING NORMALLY. MAINTENANCE FOUND THE MAU 2B BAD AND CHANGED PER EMB AMM.