Hi. Welcome to KLOV and congrats on your purchase. Lethal Enforcers is one those games I loved to play in the arcade. Anyway, unfortunately your sound issue might be a bit of a pain to deal with. Basically if you look at the game pcb you'll see a large, black chip with the Konami logo in it located near the upper right corner. That's a custom sound chip and unfortunately there are capacitors on it that tend to leak and cause sound issues. It's a problem that's also very common with Konami's X-Men and probably a few other Konami games from that era that used it. Your best bet would probably be to find another board or see if someone is willing to try to replace the capacitors for you, unless you felt confident enough to try it. I've been working on doing that for a few X-Men boards and it's been a battle. Now it's possible that's not your problem, but that's where I'd put my money. Take a look at that chip and see if notice any corrosion or it looks like it has fluid leaked on it.