What was found
(CAN) 5 MINUTES AFTER DEPARTURE, CREW RECIEVED A 2 ENGINE OIL PRESSURE WARNING LIGHT, GAGE STILL SHOWED PRESSURE, CREW SHUTDOWN ENGINE IAW QRH, ACFT DIVERTED TO SEPT ILES DUE TO WEATHER. MAINTENANCE INSPECTED WIRING AND FOUND NO FAULT, OIL PRESSURE WARNING LIGHT SWITCH WAS REPLACED, GROUND RUNS CARRIED OUT AND ACFT RETURNED TO SERVICE.