Power Brush won't rotate

First time using the Power Brush on my new Shark Navigator, 5 stairs into it, sounded like it picked up something and the brush quit rotating. I immediately stopped, removed the tool and tried to find what was stuck. I see nothing stuck. I can't even rotate the brush by hand, if attached the belt just slips, with the wheel removed that holds the belt, I still can't get the brush to rotate by hand. I can move it maybe 1/2 inch but that's it. It's locked. The cover will only lift to about 1 o'clock if that makes sense, then it stops. The instruction book looks like it is removable and I might be able to remove it by prying it off the "pegs" on the end, but don't want to break it. Any suggestions?

I was able to get it off the pegs to remove it. I can force turn it a little more, but it still does not turn when the vacuum is on. I tried both settings just to be sure I wasn't using the wrong one. Neither makes the wheel turn.