First slot machine, IGT Double Black Tie. Where to start?

I have a feeling there’s not going to be just one or two issues with this machine, so I thought it would be easier to make a video as opposed to describing every issue.
Machine will not fully power up, and there are a few loose wires. LED readouts are blank, fuses in power supply are all good. And the validator cycles multiple times after power up. If someone could point me to some manuals and schematics, that would be sweet. I’ve restored other coin op devices, from payphones to parking meters, and I am actually a vending and amusement tech, so I have a good understanding of electronics and electrical, as well as mechanical systems, I’ve just never worked on a slot machine.

Here’s the video link.

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