Engine is a 2013 SHO 200. I've had it for just under 2 yrs. There are times when there would be a drip of fluid that comes out of upper vent plug. I have changed the gasket a couple of times, and added fluid (even though it seemed to hardly ever need any). I changed the engine oil yesterday and was changing the lower unit fluid, and it had water in it (very milky). Never in the past had it had water in it. Any ideas on where to start?