As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORTED A YELLOW HYD SYS FAILURE. AN EMERGENCY WAS DECLARED AND THE FLIGHT LANDED WITHOUT FURTHER COMPLICATION. YELLOW SYSTEM HYD LEAK AROUND CHECK VALVE 3059GM. CHECK VALVE REPLACED WITH NEW SEALS, NO FIX. YELLOW SYSTEM MAIN HP MANIFOLD CHECK VALVE 3059GM PACKING REPLACED IAW AMM 29-13-14, PB 401.