Hoping for some advise. Rescued a Bally circus from the trash recently . Got it home and turned it on. Lights didn't come on . Tapped the left flipper and they came on for a second .would stay on if I held them . 3rd player score reel wouldn't reset . When. It finally zeroed out , it would start cycling through again . Sounded like a motor was still running even when the reel was at zeros . Then it would start cycling through numbers again . I took a video of the switches in the back if it's possible to upload . Any ideas where I should start trouble shooting ?

No I don't have a schematic. In the process of getting one
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The switch that possibly never opens that you mentioned , would it spark ? I noticed one that would spark

The are a where I'm noticing the blue spark is marked 0 reset

Thank you ! I will give it a shot tonight and let you know what I find