As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORT: "COMBINED HYDRAULIC SYSTEM LOSS OF FLUID WHILE AT CRUISE FLIGHT". INSPECTION REVEALED LEAK AT FLIGHT SHUTOFF VALVE "TEE" FITTING. O-RING REPLACED IN FITTING RESOLVING LEAK. AIRCRAFT RETURNED TO SERVICE WITH NO FURTHER PROBLEMS.