Please help with by telling me what went to a switch and what went to a bush button .a couple of those wires have voltage to them.picture is in  my profile pics .there is looks like 2 green wires or 3  possibly ,1 brown,1 white and 1 black I'm assuming somebody those wires went to the menu switch and a couple others possibly went to a push reset. Button .am I correct or not

This is why I am interested in the flashing candle, the different flashes.

Another song added!

Mystical Mermaid: Splish Splash (1958)

https://music.youtube.com/playlist?list=PLUfhy-O95LcjARYivLYqiPBUnnMj4FEA6&si=eI457HcqcglnlKAH

Where is this located?

0 would indicate door open.... no optical connect.
There is supposed to be a constant pulse.

The intent of the pulse was to thwart cheaters.... people would pick the locks and open the door.
This would usually set off an alarm (silent) if the proper code had not been entered into the player tracking system by the security dude changing out the cash box or hopper contents.
The hack would be to simply use an IR light pen to blind the optics that the door had been opened. This kept the candle light off, kept the back room computer at bay, and the thief could swiftly empty the cash box.... coin would not be an easy or lucrative theft as you need a ton of it to be worth something.

To thwart this, IGT did two things.
1. Put a lock on the cash box door.
2. Moved to a specific pulse modulation of the door optics.

The first was to slow the thief down. If the door closed without the cash box the candle light would flash for service and picking a second lock would take time.

Once again I am no expert on the self tests so I am not sure if this is the correct behavior or not.