The vinyl headliner and trim sheets are curled around the edges and peeled back. When left alone for a couple of months, it hangs down a few inches below the edges of the rear side windows and looks really nasty from the outside.
I bought some rubber cement a few months back and went around the perimeter, following the directions on the can. The end result didn’t look great, but the headliner was at least back in place with only the crispy, curly edges hanging down. As per usual, the “fix” lasted a month or two and was back to hanging around.
Using the same contact cement as before, I slathered both surfaces and waited for it to start to set up. I had also picked up some industrial strength adhesive in a little tube, like a super glue tube, but not. I dabbed some of that on the crispiest, curliest edges as well.
Unrelated, I finally bought one of those magnetized parts bowls that I had been eyeballing for years at Harbor Freight. While working on the brakes, I felt how strong the magnet was and went sopping for a set of various sized ones on Amazon (Amazon link). They worked really well to hold the edges in place as the contact cement dried.