I recently sold a demo man and the guy who purchased it reported that the magnet was no longer working yesterday. After running through some troubleshooting, the magnet once again works but the ball launch button no longer registers. I had him run through testing the button, then jumping at the switch, and finally jumping at the MPU board, J209-1 to J207-1, and still no activation in the switch matrix. Everything else in the row and column of that matrix tests fine. What am I missing here?