I have a 97 sea ray 18' with a 3.0 merc and alpha one drive. On top of my running problems I notice water in the bilge. I found out that if I put the lower unit all the way up sitting on the trailer backed in the water, water will come in the bilge. I can't hear the water coming in nor can I see it. I quickly checked the bellows and can't see any holes. I know the shifting bellows went on my old sea ray and you could hear the water coming in. Any other ideas in what to check? <br />Thanks for any and all help