Got it figured out. In case anyone else has the same issue and comes across this post … the piece at the green arrow is part of the back cover and a small sliver of it sits below the belt tensioning “thing.” A screwdriver and hardly any effort will push that piece out from under and he cover comes right off. I was skittish afraid any banging around or pulling might effect the belt tension and had I not been a tug on the back cover would have likely released it as well.
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