I have a problem. I just bought an open bow runabout and the depth finder doesn't work right. It just reads 2 feet constantly. (I know the main channel at the lake of the ozarks is deeper than that.)The digital gauge in the dash says it is made by Leisure Electronics(?).<br /><br />So, two things, I can't find the unit, it is obviously not externally transom mounted. Also, if I do find it, what do I do to fix it?