This happened on my 2002 aluminum framed TM, so this one may be different.
I suffered a separation of the wall from the roof a couple of years ago as I was doing some work. It turns out that the wall is secured to the roof with large (2"x#6?) screws. I first removed the edge molding from the affected area. Then I secured the wall to the roof using some bar clamps. Then, starting at one end only so that I wouldn't just drop the wall, I removed the screws from the top, tightened the clamp a little to reseat the wall to the roof, drilled new screw holes, then inserted new stainless screws.
NB: because aluminum reacts chemically with stainless, you must coat each stainless screw with silicone or other sealant.
If the wall or roof is actually twisted out of shape this may be more difficult.
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