As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT ABOUT ONE HOUR OUT OF VTBU AFTER TAKE-OFF AIRCRAFT WAS LOSING HYDRAULIC FLUID. DID IN-FLIGHT TURNBACK, DUMPED FUEL AND LANDED BACK AT VTBU. RAN ALL APPROPIATE CHECK LISTS. FOUND NR 3 ENGINE HYDRAULIC PUMP SUPPLY LINE LEAKING. REMOVED AND REPLACED LINE AND LEAK CHECKED NORMAL IAW MM 20-12-0 AND MM 29-00 & 71-00.