I have a 19 foot inboard/outboard. Last week I took it on vacation and had it tied up in a marina all week. I noticed I got a little water in my bilge. Never enough to kick on the pump, maybe a cup or two per day. Is this a concern or just normal? I can't tell where it is coming in, but it must either be where the outdrive penetrates the transom or seeping through the drain plug.