The lights you're describing are what almost all of these machines use. The little silicon sockets they go in are hard to find if you need replacements but there are substitutions.
I haven't modded any of my machines other than converting them to use LEDs. I bought a step down transformer and just simply plug them into the power strips coming off of that.
I doubt yours pays off in sets of 5. I've never seen that before and the jan ball I had didn't either and it sounds like mine played just like yours.