The Lethal Enforcers Konami 054986A is an ‘special’ audio processor on select Konami arcades. Lethal Enforcers made by Konami has this audio processor. When I purchased the arcade the audio was fine but by the time the arcade was transferred to a different location the audio became low, muffled and it clearly sounded like there was an issue. After a bit of research, I found out that capacitors looks their ability to hold energy.
Below is the schematic of the top side of the 054986A audio processor. Their is a bottom side and I hope you do not need to replace anything on the bottom side because it will result in un-solidering 64 pins just to get to the bottom. I hope you do not have to do that. If you do need to do that make sure you have a 6-pack of Great Lakes Dortmunder Gold on hand.
This is what it looks like repaired!