As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOSS OF HYDRAULIC PRESSURE EN ROUTE HYDRAULIC QUANTITY NORMAL. FOUND O-RING DAMAGED AT NR 3 ENGINE HYDRAULIC DRIVEN PUMP PRESSURE PORT. REMOVED AND REPLACED O-RING AS REQUIRED IN ACCORDANCE WITH DC-8 M/M 22-60-0. OPERATIONAL CHECK NORMAL IN ACCORDANCE WITH M/M 29-10-12; NO LEAKS FOUND.