As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON REACHING CRUISE ALTITUDE GOT THE PRKG BRK NOT RELEASED CAUTION MESSAGE. COMPLIED WITH QRH, AND THE MESSAGE DID NOT DISAPPEAR. EMERGENCY DECLARED. PERFORMED FAILURE OF THE EMERGENCY/PARKING BRAKE SYSTEM IAW FIM TASK 32-41-00-810-864-A. CMC FAULT CODE 32400016UT1. TROUBLESHOT AND REPLACED EMER/PARK BRAKE PRESSURE SWITCH NO 2 IAW EMB 170 FIM 32-41-00-810-864-A AND AMM 32-44-09-000/400-801-A. FAULT CLEARED. FUNCTIONAL CHECK GOOD