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Wild Thing with Scorpion board


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Hi all!

I've bought my first old gambling machine with a scorpion board.
I am trying to bring it back to life, because I would love to have this beauty on display in my man cave!
However I am running into some issues, and I was hoping for someone to guide me in the right direction.

I have replaced the two big capacitors on the power unit, and now it powers on fine.
However when I push in the back door switch (to emulate a closed door), it shorts the 10A fuse on the power supply.
Even when I've disconnected everything except the motherboard, so I think there's an issue with the motherboard.
 

I have taken some pictures of this old scorpion motherboard. Some things that I noticed are a leaking battery. But I'm not sure if this could cause a shortage, and I'm not sure if the machine would power on without the battery?
Also, IC12 (right one on the picture) has some discoloration. This is the only IC on the board that has this. Could this be an internal problem? If so, where can I get a replacement?

And last one, on the back side there is some corrosion on the 3 battery pins and some pins nearby.
The copper lines in that area are also bloated.

So what should I do next? Who can point me into the right direction?
This project is so exciting!

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Edited by zweetkonijn
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Update on the project:

- Removed the battery and cleaned everything up. Some of the lines are visible now, but I dont think that will cause an issue?
Still checking a lot of components, but I cannot find the fault yet.

Also a question, what state should the switches be in at the EAM part? 
Should they all be ON or OFF?

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