Help Request Opening Casio CT-S1000v

I have a key that got popped up and I think I could fix it, get it to go back into place if I could open it up and access the innards. I am afraid to force it open, after removing all the screws it still seems to hold together in the middle, the edges are coming up just a few centimeters, but something is holding it together still. Any suggestions?
Oh, the Knobs on top of the keyboard wont come off. I tried pulling on them with as much force as I was comfortable applying without damaging the knobs, but was scared to damage those so… any suggestions are appreciated.
Thanks.

Hi, I’m not too familiar with this keyboard but make sure there are no screws still in on it’s rear panel. Also make sure the knobs don’t have any micro screws around tha knobs perimeters. They would be the size of an eyeglasses screw type. My best guess is it’s rear back panel still has some screws. I hope this helps and don’t force anything. Good luck!