As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT IN FLIGHT RECEIVING A CAS MESSAGE INDICATING THAT THE LEFT WING ANTI-ICE SYSTEM FAILED. THE MAINTENANCE VENDOR TROUBLESHOT AND DETERMINED THE LEFT PYLON PRSOV (VD002) WAS DEFECTIVE. THE DEFECTIVE VALVE WAS REMOVED AND A SERVICEABLE CONDITION VALVE WAS INSTALLED. LEAK CHECK AND FUNCTIONAL CHECKS SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.