I was able to figure out how to remove and replace both belts. The link bwdbrn1 inserted pointing to an Oldphil post was key tp getting it apart. I have pix to post, but I need to grab a few more to complete the story. That's the good news.
Looks like I'll get a chance real soon to snag some more images: we got another 6in this morning, I was a couple of passes into clearing when I stopped to turn around, releasing the drive but not the auger. When I was lined up for my next pass I engaged the drive, but no go. Looks like it threw the drive belt again. I've got it warming up in the garage before I tear it down again.
The only good news is there's one bolt (of 10) that secure the auger housing to the engine/trans/wheel assembly that's A REAL PAIN
to remove/replace. I left that one off just in case.
I did check it had no impact on this current issue.
Since the drive belt jumps after I release the drive handle...I mean, I'm going along under power, then I release the drive, upon re-engagement, nothing...I'm going to look at how loose the drive belt tension pulley is. Any other advice gratefully accepted. Ahhh, fun with winter!