I've noticed the same problem with my 122 (pre-quick attach era) and my 107 (quick attach). It's a good thing you found out the mule drive wasn't sitting in the quick attach. That'll help straighten things up a bunch.
Something else I've found is that the lift mechanism will wear thin where the the back bar of the sub-frame slides up onto it. If you take the deck off and slide the sub-frame out, you'll see it right where the lift handle is welded to the one inch bar that does all the hard work. Those two lift arms that do all the heavy lifting should be close to parallel in every direction. Both the ones on my 107 and 122 have the right side one hanging lower than the left side. There was a difference of about 1 1/4" at the worst and it was causing my deck to be completely out of level.
So I took the lift mechanism out, had it rewelded (too poor to own my own welder), primered, painted, and now they're nice straight and even, and so's my lawn!
For what it's worth, I went to a show this past weekend and saw a few lift mechanisms for Cub Cadets for sale. Some of them had a very similar condition, so perhaps this is a common problem?
Hope you get things sorted out soon.
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