Hi Dendoc

If your problems return you can read what I did to get mine going here.

https://groups.google.com/forum/m/#!topic/rec.games.pinball/9lApqQOKy2M

It hasn't missed a beat since.  There's not many components on the board so it is much cheaper to fix it up than to replace if you have a little skill with a soldering iron (even if you replace all the components on the board). Much more satisfying too.