As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1455, BOS-DCA. (AIRCRAFT DECLARED AN EMERGENCY INTO DCA) 'PARKING BRAKE NOT RELEASED EICAS MESSAGE INTERMITTENT THROUGHOUT FLIGHT. MESSAGE NOT DISPLAYED DURING APPROACH AND LANDING. NORMAL LANDING; REMOVED AND REPLACED EMERGENCY PARKING BRAKE PRESSURE SWITCH SYS 2. OPC CHECK OK ON THE GROUND, REF AMM 32-44-09.'