I have a 2000 Sylvan 1600 Expedition DC that I purchased last fall and I want to upgrade the fish finder but I can't figure out how to run the cables from the finder to the transom. The old cables disappear into the gunnels and I can't figure out how to access that area. There are enclosed side storage bins and seems to be space above them but I haven't been able to figure out an access. I have removed some screws along the top of the gunnel but that doesn't seem to work either. I feel dumb asking this but if anyone knows it will sure make my job easier. Any help is much appreciated.