What was found
PARKING BRAKE NOT RELEASED, MESSAGE IN FLIGHT. DECLARED EMERGENCY, RETURNED TO FIELD, LANDED WITHOUT INCIDENT. SERVICED EMERGENCY PARKING BRAKE SYSTEM 1 ACCUMULATOR, INSPECTED BOTH EMERGENCY PARKING BRAKE PRESSURE SWITCHES, NO DEFECTS FOUND. CLEANED AND RESECURED BOTH PARKING BRAKE PRESSURE SWITCH ELECTRICAL CONNECTORS. OPS CHECK GOOD.