have a problem with oily exhaust fumes under the cowl, I removed the top cover on the drive shaft housing and found a 2 strange holes that looks as if they are not original, cant see them anywhere in the manual, when the engine are running exhaust fumes (and water ????) comes out of the hole, one of the holes has a rubber plug, the other on hasnt, any ideas why these holes where made? And is it a problem with the fumes and the water.
