Try re-seating all socketed chips on the boards.
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To rule out the speaker or speakers you can adjust the volume POT and you should hear static at least. Volume POT is usually on board somewhere or right inside coin door. If you follow those unconnected wires backwards do they lead to your speakers?
If you're missing a molex connector at the "M" location then that may be the location your loose wires go to and be the sound issue.
Looking at the schematic that "M" location says motor and rocket. Does your gun motor vibrate and does the rocket launcher button work? My guess is that molex plug goes to the "M" location with the red/white stripe furthest away from the "M" and that black wire came out of the molex plug closest to the "M" just looking at the board picture above.
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