SUCCESS!

Was speaking to my friend about our plan of attack for the next pinball repair night and he made something twig about the F3 fuse. I remembered the fuse holder looking dodgy, so I googled it. The Gottlieb System 3 repair site said that this vertical style fuse holder often fails. I googled more and found that someone else had the same DMD problem as I had.

http://groups.google.com/group/rec.games.pinball/browse_thread/thread/8cf2dce648b2b82f

I come home last night and swapped the Freddy fuse holder into my machine and when I turned SFII on, the DMD lit up. It brought a tear to my eye!

After the 2nd ball, the left flipper failed. This wasn't too alarming in the grand scheme of things.

Today, I went through the tests and it failed at:
"Relay & Solenoid Test - Solenoid: 18 - Left Flipper 67". It also failed at a number of tests that ended in 67 before and after this test.

Thanks for everyone's help over the weeks.

Cheers!
Adam.