What was found
IN CLIMB WITH MCT SET, NR 1 ENGINE OIL PRESSURE DROPPED TO APPROXIMATELY 37 PSI WITH FLUCTUATION OF PLUS AND MINUS, MINUS 7 PSI. WHEN THROTTLE MOVED TO IDLE, OIL PRESSURE DROPPED TO 33 PSI. ENGINE SHUT DOWN. ENGINE WINDMILLED FOR APPROX 3.4 HRS WITH OIL PRESSURE ABOVE 14 PSI AND FOR 5 MIN AT 4 PSI DURING APPROACH. INSPECTED MAIN OIL FILTER. CHECKED GOOD. REPLACED FILTER. REPLACED OIL PRESSURE TRANSMITTER. ENGINE OPS AND LEAKED CHECKED GOOD ON GROUND RUN.