What was found
LEFT OIL STRAINER CLOG LIGHT CAME ON IN FLIGHT. FOLLOWED ABNORMAL PROCEDURE AND SHUT DOWN ENGINE. ENGINE WINDMILLED FOR 18 MINUTES WITH 12 PSI OIL PRESSURE OBSERVED. REMOVED AND INSPECTED MAIN OIL FILTER. FOUND SMALL PARTICAL METAL CONTAMINATES WITH SOME CARBON. FLUSHED OIL SYSTEM AND REPLACED MAIN OIL FILTER. GROUND RAN NR 1 ENGINE AND REINSPECTED MAIN OIL FILTER, NO CONTAMINATES FOUND. INSPECTED OIL RESTRICTOR FITTING AND FOUND COKE CLOGGING NR 40 RESTRICTOR. SUSPECT THIS AS THE SOURCE OF CLOG LIGHT. CLEANED RESTRICTOR AND PUT ENGINE ON 200 HOUR WATCH PER P&W MM 72-00-00-810-004.