The wires a break at the same point a longer section usually in the flexi and a short part near where it exits.
How I fixed ours was solder a new piece of "silicone covered test meter cable dont use normal wire" to the long bit and pull through so the old longer part comes out, now solder to the other broken end heat shrink on both, repete for all wires regardless if broken or not, do one at a time can get hard to pull through some spray lubricant may help, I used all the same colour red for every wire ok if you do it methodically. 5a cable more than enough for all but 2
The two thick heated rear screen wires could give you a problem I didn't do these stupid me the earth broke a year or so later, for ease I ran the new wire on the outside of the flexi poking it through a hole at the flexi ends I made.