Quoted from woz:Glad you found the problem! Would be nice to know where the wire is actually broken then you may be able to fix it without adding non-factory wire.
I would check under the metal bar circled on the pic below.
You could hook one side of an ohmmeter to the wire's end, and the other side of the ohmmeter to a safety pin. Then poke the wire with the safety pin at various places to narrow down on where the wire is broken.