What was found
NR 1 ENGINE OIL PRESSURE LIGHT CAME ON IN FLIGHT, OIL PRESSURE AND QUANTITY OK, ENGINE SHUT DOWN AT 19:15 Z AS PER ARROW AIR ABNORMAL PROCEDURE, WINDMILLING PRESS, 17 PSI. REMOVED AND REPLACED NR 1 ENGINE OIL PRESS DIFF PRESS SWITCH, GROUND OPERATION CHECKED NORMAL IAW M/M 79-33-1 AND 71-00-00.