As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 160 MDW - NR 2 ENGINE 'OIL FILTER BYPASS' ILLUMINATED AFTER TAKEOFF. POWER WAS BROUGHT BACK AND LIGHT EXTINGUISHED MOMENTARILY, THEN CAME BACK ON. PRECAUTIONARY LANDING AT MDW. REMOVED THE NR 2 ENGINE OIL FILTER AND FOUND CONTAMINATION, REPLACED OIL FILTER PER PWA JT8D MM 72-61-0. RAN ENGINE AND PERFORMED LEAK CHECK. NO LEAKS NOTED. (M)