BTW, I'd strongly recommend to replace the Schaffner mains filter if that hasn't been done in the last 10 years as they tend to blow up and spread some corrosive gunk all over the mainboard. They are still made, usually not very expensive, and the new versions should be more reliable. Just make sure you don't buy "new - old stock" as that wouldn't really solve your problem.
Yea thanks - I've heard about that and I'm going to attempt to find a replacement that fits in the existing cut-out.
Here's a few more screen shots for today. I'm just posting these for anyone browsing the web looking for info that may need to see them.
So, I know that the NVRAM is bad (really the battery inside), so what happens when you run the self-test? On the back of the unit is a red switch that sets the calibration to either protected or unprotected. If that switch is in the unprotected mode, you see that it passes all the self tests (with a bad NVRAM). If it is in the protected setting, the self-tests do not pass the NVRAM, D/A converter, or A/D converter (with a bad NVRAM). And finally, you can see the screen at the completion of the self-calibration. However, once you turn it off it will all be lost with a bad NVRAM; but it does complete properly.
Only other thing I've done is to pull out the power supply to see if it can be jury-rigged in such a manner as to allow one to tweak the tweakable adjustments underneath it without using the "extender cable" the manual talks about - I think it will be possible.
More to follow ...