As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE FLIGHT, THE NR 1 ENGINE OIL QUANTITY AND PRESSURE DROPPED. THE ENGINE WAS SHUT DOWN AND THE FLIGHT CONTINUED TO NRT WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE ACCESSORY GEARBOX CARBON SEALS FOR THE HYDRAULIC PUMP AND STARTER. SUBSEQUENT ENGINE RUN-UP FOUND NO LEAKS AND THE AIRCRAFT RETURNED TO SERVICE.