I recently purchased a 86 Stratos and came across something puzzling while making repairs. While re attaching the Transducer cable to the transom, I removed three screws below the main plug that were caulked in place, and one of them leaked a lot of rusty water. The puzzling thing is that I have had the main plug out of the boat for a week. Where could this water be coming from? Should I be worried? I did see a bubble in the upper part of the transom gel coat where the water could be coming in, but not sure.