As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE, THE NR 1 ENGINE OIL QUANTITY DROPPED TO ZERO. THE OIL PRESSURE FLUCTUATED IN YELLOW BAND FOR FIVE MINUTES THEN DROPPED BELOW THE RED BAND. CREW FOLLOWED COM PROCEDURE, SHUT DOWN THE ENGINE AND CONTINUED FLIGHT TO NRT WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND OIL LEAKING FROM A PIN HOLE IN THE LINE BETWEEN FUEL/OIL COOLER AND THE LOW OIL PRESSURE SWITCH. REPLACED TUBE ASSEMBLY AND PERFORMED CHECK, UNIT CHECKED NORMAL.