Rick - If you remove the myriad screws from the inside of the case you can pull the inner liner off to expose the guts of the thing. Once inside you can find where the rub points are and lube them.
But - beware, there are lots of springs, linkages and all sorts of things that go Sproing! when you do so. I've had mine apart a couple of times to install some Bungee Buddies and it's not for the faint of heart. Once you figure out how they all go together it's pretty logical and straightforward, but by simply looking at the linkage in pieces on your workbench it's not intuitive. Definitely only take one side apart at a time so you can carefully disassemble the second one to see how the first one goes back together. The danger is that you assemble it wrong and then can't get it to unlatch.
And - there are two different length screws that attach the inner liner to the outer liner. If you don't remember which goes where you'll drive the too-long screw through the outer case. Not good. Like Hopz, you don't have to ask how I know this.
I'd suggest that unless you like a challenge, spray lube the hell out of everything from the outside and hope that works.
JayJay