goodness gracious!! well so far from what i've seen its jst the dk blue wire. all of the other wires appear to be okay. there are acouple of spots on the other wires that the coating got hot from it being next to it but no bare spots
OK, How I would replace that wire... I would go to the part store and buy dk.blue wire of both wire gauge and if it has the white tracer I would buy some white heat shrink tubing. Cut about 1/8" long to create a white marker every inch or so along the wire. Amazon vendors have heat shrink in most any size and color. Makes color coding wires too easy.
