Thanks for the info Rod,
Can you buy replacement display & display Boards for this machine?
Have you done the glass repair you are referring to before?

There are a couple of options to replace displays.  But none are as cost effective as overhauling the existing ones if the display glass is in decent shape and the segments aren't burnt to buggery.

I'd suggest contacting Aussie Pinball member "Skybeaux" who is up on the central coast.  His board work is second to none, as is his customer service.

As for the backglass.  I've only read about the technique.  It's the only way I am aware of that will fix the dreaded Bally Leopard spots.