Asteroids CP extra circuit mod? What is it?

Dervacumen

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I am in the process of restoring an Asteroids machine. I had the board repaired courtesy of Mike Salay who is awesome by the way...
Anyway, I took a few shots of the wiring on the CP. What is this little extra circuit board for? And why add the wood? Seems like someone before me was tinkering with this machine. I haven't yet traced the additional wiring but I show where one of the wires is attached to the harness.
 

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Looks like a rapid fire circuit, the wire going to the edge connector looks like the 5v feed needed to power the rapid fire circuit.

I would guess the wood is there to mount the tiny PCB and isolate it?? Overkill yes but effective, or maybe because the last owner used longer shaft buttons which would need an adaptor on a metal CP.
 
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