Gday all .

Update

 Switches register closed if I connect relevant pins on row and column connectors on the CPU board so that isolates the fault to somewhere on the playfield .

 Switch 21 (slam switch on coin door) works fine so I'd expect no issue with the coin door interface board or connectors there . According to the schematic , switch 21 effectively terminates on the coin door interface board and is connected back to the CPU via J212 .

 Will have to have another look at these 3 switches on the playfield itself . I guess next steps will be reflow connections on each switch and replace diode on each switch .. will let you know the result .. possible its a connector in the wiring loom somewhere too I spose

 Cheers
 Dave