Hello, I am looking for some advice. I have purchased a Bally Power play recently. When I had bought it, a new AllTek MPU board had been installed. Worked great for 3 days. Booted it up on the fourth day and I ran into a switch error. The outhole, top saucer, left pop bumper, and top left drop target no longer registered. Originally thought it was dirt on the switches, cleaned them and received the same error. I looked at the schematics of the Switch Matrix and saw that all the switch errors were on the same row. I ran a continuity test on the connector socket that corresponds with the row, to each of the switches and there was continuity from all the switches back to the connector, so I assume that rules out broken wires or bad diodes. Then I moved on to jump testing the pins on the board itself. I entered switch test mode, and I took a known working row, and ran one of the return row pins to each of the strobe pins and it read each switch correctly. Then I did the same test with the row pin that corresponded to the malfunctioning switches and the switch test did not give me any readings on the display for any of the return pins. I then assumed that the board had been faulty, and put in another new Alltek MPU and it gave me the same error. I am out of ideas of what could be giving me the problem. Any help would be greatly appreciated!