Have someone push the switch while you manually unrole the awning. It can be done. Even the dead motor can be forced with the current going through it. Be sure to cable tie the opposite arm so it will not come down.
I converted my king to a queen. I also reduced the size of the pedestal. About a half a day job. Remove the platform by removing the screws at the "head" end of the bed and take it outside to cut 6 inches off the side. You will have to relocate one of the cylinders by moving it over 6 inches also. I then removed the pedestal and cut 6 inches off one side. Look closely before you start cutting because you want the paneling to fit like it does originally. There will be a 2x4 or 2x2 fastened to the wall where the pedestal fastened. I removed 3 inches from each side so the bed would still be centered. I also had to move one of the rollers on the bottom of the pedestal over 6 inches. Also had to modify the framing under the pedestal and cut the panel down that went under the bed. Reattach everything and put the platform back on the pedestal. Now put your new queen mattress on and enjoy the extra room around the bed.