At my 100 hour service check, I was told there was water in my lowewr unit of my Mercury 250 outboard. As far as I know a check of the seals was done but nothing major. I was told to bring it back around 150 hours for another check. It is still under warranty, any ideas how to find the cause and what might be the repair. Bye the way, I bought it from a very reputable Mercury dealer but it was originally a 30 inch which was converted to a 25 inch. They told me there would be no problems and would not void any warranty coverage. Thanks.mark