I would tear it down, clean the parts up, and reassemble it. Replace what you can that needs replaced, and sell it. Then tell him to take that money and go buy an RC with parts support. Starting in this hobby with an RC you can't get parts for will suck, and may end his RC journey abruptly for good. But if he gets a decent RC to start out with, he may find a lifetime of enjoyment in the hobby.
Or, if you can find a couple sliders of the same car in decent shape, you can be your own parts support. But this one is pretty obscure it seems, so I bet that isn't much of an option.