My left rear window did the same thing. I thougbt "oh no, my window motor
went bad". Out of aggrevation, I kept hitting the down direction on the
switch and herd it break loose. I don't think anything sticky got in the
seal, but for some reason, probably lack of use, it just stuck. No problems
since. I'd try helping them down with your hand to see if they aren't just
stuck to the seals.
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