This Bally Hi-Deal has been a nest at some point. The lightbulbs and solenoids make for a nice warm private space for mice to live. Pictures show the mechanism panel (the electromechanical computer that handles game logic) with nesting material like fluff and shredded paper. There was lots of poop in the cabinet too. I'm gonna strip it down and give it a scrub so that when I'm back inside this game fixing something else I'm not working in filth again.