vent fan

so, opened the main panelbox above the ref.
the breakers for the 120v a/c and the fuse panel for the 12v DC are there , removed the two retaining phillips screws to the 12v DC fuse panel, not disconnecting any wires i pulled the panel and swung it wide and viola' attached was the transfer switch -photo below ... now to find a replacement and repair. found scorched 10ga wire on the neutral input side, which shorted the internal circuit of the transfer switch neutral circuit and showed...