First off, I no expert here, so I’m only stating what I think I’ve figured out.
All of the switches are wired according to the switch matrix. Each switch on the chart has a diode across its wires to isolate it from the switches around it in the chart. You most likely have a shorted diode or some other short somewhere that is causing the machine to think the Yagov switch is being triggered. Visually inspect the switches that share rows and columns on the switch matrix with the Yagov kicker switch for any obvious bending of wire leads or burnt or bent diodes.