John,
I've never had a chance to view those DVD's, but Chuck had a website years ago with a few tips and it was good information. Hope you find a set.
But for anyone that owns one of these receivers please check out these sites:
http://mailman.qth.net/pipermail/r-390/Subscribe to this email reflector, read all the archives. It is a great learning tool.
https://www.r-390a.net/ Using the above link find the References section and then download the Y2K R3 manual. It is just about the best source of information.