If its just stripped some insulation off and not damaged the wires, I'd use some liquid electrical tape and just reseal/reinsulate them. If you've damaged the wire inside, it'd be best to replace the wires with some quality rc type silicone wire.

If this is still in warranty, doing it yourself will prob void the warranty. If its not in warranty, only thing sending to Traxxas will do is cost you time and money.