“01” Lowrance X-91 elect. parts schematic

Does anyone here have access to an electrical schematic of a X-91? I brought it to work and had my (very sharp!) systems guy, look at the problem I am having with this finder. There is a transister and an electrical choke, (what he calls it!), that gets very warm when power is applied. The unit, when on my boat, blows the fuse instantly! To send it in to get fixed, is way to expensive, (3/4 price of a new one!) If I can get to a “parts list”, I know that my man can repair it.
Any help? Thanks.