So, I recently worked on the driver board of my Dredd. It's a Rottendog replacement, and I had a couple of dead transistors. Afterwards, when I got it back together, the popper on the left side(the subway popper) kept going off during play. I was initially concerned that I had fixed one thing on the board while breaking something else, but I decided to look at the mech first and give it a good cleaning in case that was it. One of the wires to the opto was broken, and intermittently making contact, apparently triggering the mechanism. I also noticed that one wire on the coil itself was mostly broken. Resoldering the opto wire fixed the firing, and I resoldered the coil to prevent future problems. It was hard to see that the wire was broken off because the shape of the wire kept it right at the same spot, and if I hadn't given each wire a tug to see if I had problems there, I wouldn't have noticed. Just a heads up to save someone else a little debugging trouble if they see this issue in the future.