I have a similar problem on a 2020 GT5 31R5. The ceiling material is like contact paper on thin panels. My issues are at the ceiling seams. The dealer attempted once and Forest River attempted again last year at the International Rally to repair. It comes back. Both used a low temperature heat gun and tried to smooth the bubbles to reattach the glue. Since my bubbles are on the seams, FR also put wider ceiling seam trim strips to try and hide it. It returned within a month. From research in the forum here, some recommend 3M 38808 adhesive as a solution, but they are installing on older coaches, so I think the material is different then contact paper. My concern with adhesive is bleeding through and leaving a noticeable spot. I will try the glue mentioned in warmer weather in small spots first. Use a small paint roller or plastic putty knife to help smooth. Good luck and keep posting if you find a solution.
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Mark & Connie
2020 GT5 31R5
2006 GMC Canyon (Toad)
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