What was found
FLT NR 40 - TPA-EWR - DIVERTED TO ATL, NR 3 ENGINE LOW OIL PRESSURE FILTER BYPASS LIGHT CAME ON IN FLIGHT. BURNED OUT TWO BULBS, ALL OTHER ENGINE INDICATIONS NORMAL. PERFORMED PRECAUTIONARY SHUTDOWN. FORTY MINUTES OF WINDMILL AT 30 PSI. CLEANED OIL IN CANNON PLUG OF DIFFERENTIAL PRESSURE SWITCH. REMOVED AND REPLACED MAIN OIL FILTER, NO DEBRIS OR CONTAMINATION FOUND, OIL LIGHT OPS OK PER MM 79-00. RAN ENGINE, OPS AND LEAK CHECK OK. (M)