Talking Percy Track Master Not Working

From playing around with it the “safety switch” is not depressed in any way I dont think there was any thing holding it down. There where no lose parts inside when I opened it up the board from the looks of it are caked in crud any way to clean a board like this? So I take it if its a dead board or switch he is spare parts then. The parts seeing as how its a out dated model are hard to come by lol