Thoughts on how to fix a depression in the roof

Bodyperson said
You might be able to feel (or not) the braces through the headliner. Did you try and push it at all? Might be able to pop it right out until next time But Id really like to hear more about the dry ice trick.

I tried to push up on it but the headliner prevented me from making good contact. I'll have to bite the bullet and pull the headliner out.