As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN CALLED OUTSIDE OF LAS AND INFORMED MX. CONTROL THAT THE NR 2 ENGINE OIL QUANTITY WAS SLOWLY DROPPING AND OIL PRESSURE/TEMPERATURE WERE NORMAL. AIRCRAFT DIVERTED TO LAS. REMOVED AND REPLACED FILTER BYPASS SWITCH LINE, ADDED 10 QTS OIL FOR LOSS, LEAK CHECK GOOD PER MM.