My 997 C2S Cab had the CF interior package and sun wreaked havoc on parts wherever they were narrow or w/ complex curves. For instance, the ashtray was replaced 2x under warranty b/c cover edges kept peeling up. Entire center console almost needed replaced but CPO warranty ran out.
The toughest were strips on dash at the a-pillar along defroster vents. Warranty covered 3x. When they peeled up last time I was quoted ~ $450 per side to replace. Um new rear tires or CF on dash - LOL. Tried to get them stay down w some HD contact cement and even Goop but to no avail (similar to I think what your PO tried).
Finally, I just peeled off the entire CF strips and sanded residual glue down to get an even surface on plastic base. Then I bought some "high-def" looking CF wrap in matte finish. Trimmed carefully, applied contact cement to both surfaces and applied. Stayed and nobody was the wiser unless I pointed it out. I had benefit that no other CF parts were within same eye line to see difference but regardless it looked good.
Good luck
