I have a slight but steady oil leak at the rear of my AQ140c. There is a hole at the bottom of the flange of what I think is called the Flywheel Housing and it always seems to have a trail of oil that drips into the bilge under the bilge pump. I thought I was missing a fastener but I wasn't able to screw one in and so I think the hole is there for another reason. I am collecting 1/2 to 1 ounce of oil a day. Is there a chance it's caused by an overfill of engine oil, or is there a sela that has gone bad? I have attached a couple of pictures that show the area I'm trying to describe. Any comments are welcome. Thanks.