bigmessowires,

At the moment I am busy working my way through your suggestions from 'Macintosh Repair and Upgrade Secrets'. I'll definitely source and replace the resistors that are mentioned!

Also I have taken various photographs of the Analog Board for all to see:

https://drive.google.com/folderview?id=0B6j6P7lBWw-BMkIwUk85aW9RRUU&usp=sharing

It looks like there is some damage to resistor R48. It is brown in the middle where the black band is.

I hope this helps!