One of the two on the floor is probably the drop door switch, I'm not sure what the other one is. Sometimes, dealers remove the one on the back of the validator cage to avoid issues, that may be it. The one with the zip tie is the logic door switch. Usually the mpu door actuates the switch when you close it, but most dealers sell the machine with no mpu door for cooling issues. The light bulb lights up when the attendant key is turned while the main door is closed. It is used to look at the mechanical counters through the little plastic see through window on the monitor bezel.