As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED HYDRAULIC SYSTEM LOST FLUID RAPIDLY IN CRUISE EMERGENCY SHUT-DOWN. HYD FLUID FELL TO STANDPIPE. FOUND O-RING BLOWN ON SLPT INLET CHECK VALVE ON SLOT CONTROL VALVE. REPLACED O-RINGS ON CHECK VALVE. LEAK CHK NORMAL PER DC8 MM 27-80-04, PG.201. CHANGED NR 3 ENG HYD PUMP AND FILTERS IAW MM 29-10-12. SERVICED HYD RESERVOIR IAW 12-30-01.