What was found
(CAN) IN-FLIGHT, NR 2 ENGINE OIL PRESSURE WARNING CAME ON, PRESSURE WAS CONFIRMED LOW AND ENGINE SHUTDOWN. AFTER LANDING, INVESTIGATION REVEALED MAIN OIL FILTER WAS CLOGGED WITH METALLIC DEBRIS. THIS IS STILL UNDER INVESTIGATION AS TO THE SOURCE OF METAL. ENGINE WAS REPLACED AND ALL OIL SYS EXTERNAL COMPONENTS REPLACED. ACFT WAS RETURNED TO SERVICE. WAITING FOR SHOP STRIP REPORTS TO DETERMINE SOURCE OF CONTAMINATION.