As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 4 ENGINE OIL QUANTITY DECREASED INFLIGHT, WHEN OIL PRESSURE BEGAN TO FLUCTUATE AND LOW OIL PRESSURE CAUTION LIGHT FLICKERED. COMPLETED THE PRECAUTIONARY ENGINE SHUT DOWN. ON GROUND RUN FOUND OIL LEAKING FROM BREATHER PORT. REMOVED AND REPLACED ENGINE PER BOEING MAINTENANCE MANUAL 71-00-02.