Sounds like a wire issue, so let me get this right;

The Start button does not work, the right fire button does not work, and maybe the left one also.

Have you been into switch edges to double check these, also test the tilt plum bob while in there, then from the last working switch or the first one not working follow the wire Green-Brown back to the next switch in the chain, and so on you may then find the break.

Good luck.

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Sound like a switch matrix issue. The first thing I would do is check the MPU for battery leakage as it sounds like 2 columns are out(the dedicated ground switches and column 1). Next, I would test continuity between the launch button and another button in that column, like the left outlane.

As for the door switches have these worked for you before? Or is this a new to you machine?

As I had this once with a new to me machine the dang 4 switches were dud, but by carefully shorting out the contact behind the enter switch I could get into tests etc, if you're confident doing so try this.

Also double check all connectors by coin door that they are 'home' and not shunted up by say 1 pin, also worth doing the same in the backbox.

What does your MPU board look like? Any battery damage? Leaking batteries?

RM

Unlike other wires J212 aspired to be an important wire.

Game on....!!...... ..........Joey

Love it when it is just a bad wire