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 THE RIGHT FUEL SHUT OFF VALVE FAILED TESTING. THIS CAUSED THE CANCELLATION OF FLIGHT. THE MAINTENANCE TEAM DETERMINED THE RIGHT FUEL SHUTOFF VALVE WAS DEFECTIVE. THE VALVE ASSY WAS REMOVED AND AN OVERHAULED VALVE WAS INSTALLED. OPS AND LEAK CHECKS WERE SATISFACTORY. THE AIRCRAFT WAS THEN RETURNED TO SERVICE.