As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PARK BRAKE NOT RELEASED EICAS MESSAGE. RETURNED TO FIELD, DECLARED AN EMERGENCY. LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED NR 1 EMERGENCY BRAKE PRESS SWITCH IAW EMB 175 MM AND CUSTOM I/O 2 IN MAU 3 IAW EMB 175 MM 31-41-07.