What was found
EN ROUTE, RECEIVED A CAS MESSAGE EMERGENCY/PARKING BRAKE ACCUMULATOR PRESSURE ALERT. DIVERTED TO COS WHERE MX WAS AVAILABLE. ACFT LANDED WITH NO FURTHER INCIDENT. NOTE: THIS WAS THE SECOND PILOT REPORT OF THE SAME DISCREPANCY IN AS MANY DAYS. MX UNABLE TO DUPLICATE DISCREPANCY. MX SERVICED THE HYDRAULIC RESERVOIR AND RETURNED THE ACFT TO SERVICE. THE CREW REPORTED THE SAME PROBLEM AGAIN ON THE NEXT FLIGHT SEGMENT. DIA MX REPLACED THE HYDRAULIC ACCUMULATOR PRESSURE SWITCH IAW AMM 29-10-00. SINCE PREVIOUS ATTEMPTS TO DUPLICATE THE DISCREPANCY WHILE THE ACFT WAS ON THE GROUND WERE UNSUCCESSFUL, MX REQUESTED A TEST FLIGHT AFTER REPLACEMENT OF THE PRESSURE SWITCH. TEST FLIGHT RESULTS WERE SATISFACTORY.