What was found
(CAN) ON A CARGO FLIGHT FROM CINCINATI TO MONTRIAL NR 2 ENGINE WAS SHUTDOWN. AIRCRAFT WAS DIVERTED TO TRENTON ONTARIO BECAUSE COCKPIT CREW WERE UNABLE TO CONFIRM THAT THE EDC WAS ACTUALLY DISCONNECTED AFTER SELECTING DISCONNECT, DUE TO LOW OIL PRESSURE. THE NORMAL WAY ON PASSENGER AIRCRAFT IS AIR FLOW REDUCTION IN COCKPITT AFTER EDC DISCONNECTED. ON CARGO AIRCRAFT THERE IS NO REDUCTION OF AIR FLOW DUE TO DUCTING MODIFICATION. MAINTENANCE WAS DISPATCHED TO CONFIRM EDC DISCONNECTED AND RELEASE AIRCRAFT IAW MEL PROCEDURE. AIRCRAFT RETURN TO MONTRIALWHERE EDC WAS REPLACED AND AIRCRAFT RETURN TO SERVICE.