Willams Grand Prix Pinball Restoration

After som initial valve problems with the compressor I finally got the thing working yesterday. It was time to get rid of all the dust and soot on the main board and in the backbox. Here are some pictures from the session.















After removing the actual box from the backbox, leaving the reels and relays, I noticed that the paint on the backbox glass was very loose and would fall off in small pieces when looked at. I guess I have to fix it with some kind of spray, if that's possible. Will get back to that after the reset problem.