As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR 2 ENGINE OIL FILTER BYPASS LIGHT FLASHED 3-4 TIME ON CLIMBOUT AND THEN EXTINGUISHED, ALL OTHER INDICATIONS NORMAL. CREW ELECTED TO RETURN TO BASE FOR MAINTENANCE ACTION. CARRIED OUT FIM 79-05, TASK 818, FOUND FILTER CLEAN AND REPLACED THE SAME. REPLACED OIL FILTER BYPASS SWITCH IAW 79-21-07.