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 DURING PREFLIGHT CHECKS THEY RECEIVED A WING ANTI-ICE VALVE FAULT INDICATION. THIS FAULT CAUSED THE FLIGHT TO BE CANCELLED. THE MAINTENANCE TEAM TROUBLESHOT AND DETERMINED THAT THE RIGHT PRESSURE SWITCH "R5DL" DEFECTIVE. THE PRESSURE SWITCH WAS REPLACED THE SWITCH WITH NEW PART NUMBER SWITCH. FUNCTIONAL CHECKS WERE SATISFACTORY. THIS AIRCRAFT WAS RETURNED TO SERVICE.