As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, NR 2 ENGINE OIL BYPASS FILTER LIGHT CAME ON. DIVERTED TO LAS WITH THRUST LEVER BACK TO IDLE, LIGHT REMAINED ON AND WENT OUT DURING DESCENT. INSPECTED NR 2 OIL FILTER AND FOUND NO CONTAMINANTS. DRAINED ALL OIL FROM TANK AND RESERVICED. OIL FILTER BYPASS STILL REMAINED LIT. REMOVED AND REPLACED OIL DIFFERENTIAL SWITCH AND ALL CHECKED GOOD PER MM.