Pachislo Slot Machine question

I have a pachislo slot machine and it has 3 key holes…1 at top right to open main door & service door
a second one to reset machine inside lower left… and now for the baffling one…there is a keyhole right side under coin slot that one has 3 wires coming off it and the main door key makes it turn left and right but I cant tell what it does.
Any suggestions ?

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