I am having a weird issue with my Mario Bros Gottlieb system 3. There is an entire row of switches not working. However, when I touch a lug on one of the switches with the soldering iron, the entire row works fine for a few minutes. The soldering iron doesn't have to be hot, just plugged in. This is true for both playing a game and in test. How is this possible? Is the soldering iron grounding the switch? Does this mean I have a bad wire? It is switches 30-37.
I have reflowed the solder on all switches in this row. It will fix the issue for half a game or so, then nothing in that row registers until you simply touch the soldering iron to the switch.