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Currently only own one Sys11 machine, High Speed, but it's the third one I've had.

I've played 19 of the 30 SYS11 machines though.

Yep. I had 2 at once years ago, one was supposed to be a parts machine but was just too nice to part out, so I tracked down the missing parts and repaired the boards. Sold them both to finance other machines and then regretted it. #3 is going to get a new CPR reproduction playfield and will not be leaving my collection this time.

Just picked up HS#4 last night. lol
I'm addicted. Sadly this one is only going to be a parts machine, there's way too many parts missing, but I will make one really nice machine out of two.

Does it gradually fade out, or does it just go out all at once? Check for cold solder joints at all the headers on the MPU and background sound board and clean the volume pot.

Looks like you're missing your knocker coil, plunger, and coil sleeve. Don't forget the diode on the coil and make sure you hook the wires up the right way.