As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT FL350 GOT R HYD QTY EICAS MSG AND R HYD RVSR LT ON OVERHEAD PANEL. R HYD QTY AT .47. FOLLOWED PROCEDURE AND TURNED OFF R ENG HYD PUMP AND R DEMAND PUMP. R HYD QTY STAB AT .37 REST OF FLIGHT. FOUND O-RING ON PLUG AT NR 13 SPOILER BLOWN OUT. REPLACED O-RING ON NR 13 SPOILER ACR PLUG. SERVICED HYD SYSTEM. RAN FLT CONTROLS. NO FURTHER LEAKS NOTED. CHECKS OK.