Over the weekend I noticed black water leaking from my digital tour 109 while it was racked horizontally. I did a google search and can't find much. One guy talks about water getting in through the built-in transducer. If this is the case, I want to permanently seal this because I don't even use it (I use downscan.) I am wondering if any of you have had this problem? If so, how did you fix it? thanks