As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT HYD QTY EICAS MESSAGE WITH RT HYD QTY LIGHT. RT SYSTEM QTY INDICATING 0.47 WITH RF AND DECREASING SLOWLY 5 HOURS AND 20 MIN INTO FLIGHT. REPLACED LINE WITH BORROW PART FROM AIR FRANCE. FOUND RT ENG EDP HYDRAULIC PRESS HOSE ASSEMBLY LEAKING. REPLACED HOSE ASSEMBLY RAN ENG LEAK CHECK PERFORMED FOUND NML PART PROVIDED BY AIR FRANCE, MPN AE1010744M0174.