As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FLIGHT, CREW NOTICED NR 2 HYDRAULIC SYS FLUID DEPLETING. THEY RETURNED TO THEIR DEPARTURE AIRPORT FOR AN UNEVENTFUL LANDING. MAINTENANCE FOUND THE RT NACELLE FLIGHT SPOILER UNLOAD VALVE HAD 2 BOLTS WITH THE HEADS SHEARED FROM THE VALVE BODY. THIS WAS THE CAUSE OF THE LEAK. THE VALVE WAS REPLACED AND THE AIRPLANE RETURNED TO SERVICE.