How do you remove the chassis from a Peavey Max 115?

[JazzBassTbird]

Does anyone know how to remove the chassis from a Peavey Max 115?

There's nothing wrong with it, I just bought it used and want to clean the cabinet and grille. I've removed every screw from the thing, even the corners and handle, and it won't budge.

I have decades of experience with this sort of thing, but I'm stumped.

Thanks!