As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HYD SYS SLOWLY LOST HYD QUANTITY AT TO GAGE SHOWED 9 GAL. GAGE SHOWED SLOW LOSS APPROX 2 HRS AFTER T/O. DID LEAK/LOSS PROCEDURES BUT LEAK CONTINUED, SYSTEM DEPRESSURIZED AND ADP OFF REMAINDER OF FLIGHT. REMOVED AND REPLACED NR 1 ENG HYDRAULIC PUMP PER MM 29-11-05 OPS AND LEAK CHECK OK. FOUND HYD PUMP LEAKING AT PARTING SURFACE.