I now have two losslessly-compressed (Huffyuv) AVIs for DVDs 1 and 2. Together, they represent the entire film, but some credits are missing, as the source VHS cuts off right after displaying "Robert Watts". I also think there's a 1-2 minute drop-out somewhere in the middle, but I haven't started to look for it yet.
The quality is nice, but it definitely needs some deflickering, cropping, deinterlacing, resizing, and the works. I think the Panasonic AG-1980 would do a much better job at preserving it than my Toshiba DVR620.
It can't be the mono mix. Luke clearly says "Blast it, Biggs! Where are you?" and Porkins' scream is audible. I tried listening for C-3PO's line, but I couldn't hear it.
Here's a sample from Part 1: Sample 7
Here's a sample from Part 2: Sample 8