Well gents, I finally got around to soldering the resistor into place on Monday.  What a pain in the arse getting it into the spot right up the back of the playfield to solder it.  Could not believe it when I turned the machine on and everything now works 110% perfectly.  How can 1 x resistor have so much impact on that many switches... Thanks thanks thanks once again to all.

I've also installed Cliffy's new stainless steel hole protectors in my Mario Bros and they look superb.  My machine is not only 110% perfect mechanically but after the buff job I did using the Treasurecove Kit, it's also looking sensational cosmetically

Well done - now when you look at a printed circuit board and see all of those parts, each and every one has a specific purpose, you can appreciate how much thought and effort goes into a circuit..…