Re: humminbird 565
I have a year old plus Humminbird Model 570 Dual Beam, as I described in a previous thread, that I've been real happy with but that recently gave me a problem. I called Humminbird, described the problem to the customer service person who then consulted with their techs. From my description they concluded that I needed a new transducer. Several days later a new transducer arrived, NO CHARGE, which I installed the next day and which solved the problem.
FWIW, 68C15 I'd go for it & JW, give 'em a call. Bet they'll solve your problem.