As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, THE CREW RECEIVED A EMERGENCY PARKING BRAKE ACCUMULATOR LOW CAS MESSAGE AND RETURNED TO PHL. MAINTENANCE CONTROL FERRIED THE AIRCRAFT TO PIT. MAINTENANCE INSPECTED AND REPLACED THE EMERGENCY PARKING BRAKE VALVE IN ACCORDANCE WITH DORNIER MAITNENANCE MANUAL 32-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.