As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW RECEIVED A EMERGENCY PARKING BRAKE ACCUMULATOR LOW PRESSURE WARNING MESSAGE DURING FLIGHT. THE FLIGHT CREW REFERENCED THE QUICK REFERENCE HANDBOOK AND RETURNED TO THE FIELD. THE LANDING WAS MADE WITHOUT INCCIDENT. MAINTENANCE INSPECTED AND REPLACED THE EMERGENCY PARKING BRAKE VALVE IN ACCORDANCE WITH DONIER MAINTENANCE MANUAL 32-43-02. OPERATIONAL CHECKS WERE COMPLETED AND THE AIRCRAFT RETURNED TO SERVICE.