Can you unscrew the rear grills on Maggie 2.7 QR?

I have a pair of 2.7QR and I guess I'm going to have to do some repair via adhesive on the back of the panels.
It looks to my inexperienced eye like the rear grill is mounted on a removable frame. Is this true or is it more complicated?
I'd phone the manufacture and ask them for advice. They are extremely friendly and will have a good answer for you.