Welcome to Pinside - I looked up your game on ipbd.org and looks like a beauty. For the backglass, the two reproducers that specialize in em, Shay Arcade Group and Ron Webb, I did not see your title available but you should still contact them. You can get your actual bg restored at http://bgresto.com. For the broken play meter mech, try pinball resource, also on the web.

If you post the snippet of the schematic for bonus score reset, you'll get help reading the circuit. Fixing lots of scoring issues can often be resolved by cleaning the associated stepper units and there are lots of posts here for accomplishing that. The stepper units get gummed up over time and they have to be cleaned to move freely and the wiper blades rivet contacts also need cleaning/polishing.