I would first got into tests and perform a manual switch test on the ones that are throwing errors. this will let you know if they are actualy working or not.

The switches may be fine, but the game thinks they are bad because they have not been activated in while. Do what ssathre said and maybe you will get lucky and not have to replace the switches.

It doesn't mean replacement yet. It can mean many things. I can mean there is a switch in the matrix before in a row or column that could be the issue.

You have to examine the wires to each switch, confirm they are still attached, as they can break due to vibration.

You can test the switch with a millimeter on continuity and confirm that when the switch closes it completes the circuit.

If both check out, the issue is elsewhere, or possibly the switch itself needs adjustment as the ball may not be making proper contact.

Then you have to review the switch matrix. Check in the switch test the switches in the column above those switches and to the right. If they work, look to the wires of these switches, as the wire leading the bad switches in question may be broken off. If they don’t work, check the rest up and to the right on the same basis.

If you find that an entire row or column is out, you likely have a faulty IC for the switch matrix.

That is a good starting point though.

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Ok.....thanks...