Have 70 hours on the engine, it is ept on a lift in the down , running position. Getting oil leak coming from inside midsection and running out onto cavitation plate and running down case down to skeg. Not lower unit as oil is coming out of mid section. Checked Trim and tilt seals and fill plug all dry and clean. Any ideas where the oil is leaking from? Checked under cowl oil filter is tight and totally dry under the hood. Drain screw is tight and dry as well.