On the switch matrix chart it indicates to follow the white-green wire from the right pop to "enter middle ramp" (which I suspect doesn't work also when the pop doesn't work) to the "right ramp to car" to the "right 3 bank drop target middle" and finally to "center coin chute". Any break along that line will stop anything down the line not to work. Since it's intermittent, physically touch the wire at the switch. A visual inspection only may look like it's connected. The diode could have also come loose so check that. I'm betting on the drop target.