Looking at the rectifier board makes me wonder how the machine is actually working at all. I did note previously this board looked a bit sad but on closer inspection it is a nightmare, and I only have a basic understanding of electronics so a nightmare is probably an understatement.
I noted that Homepin does a replacement main board, wonder if he is doing a rectifier board also, looks like I need a new one.

There are plenty of threads on how to rebuild this board, or use the pinrepair guides.

http://users.esc.net.au/~boots/Pinball_Guides/default.html

Have a go, all parts are readily available.