Popup Camper Top - RR corner won't completely lower / close

First thing I can think is are you sure the problem is inside the lift support? Could it be something simple like some of the tenting is caught up and not letting that corner come all the way down? Have you already lifted it all the way back up and then inspected around in that corner for something like a cabinet door open, or a kids toy left out? What about underneath the camper? Can you see the cables and does the cable go slack yet the corner still wont come down?