My sleeper sofa seat has detached from the side of the sofa and collapsed onto the pull-out part underneath. When I lifted the seat, I can see a few nails sticking out of the seat. It is still ok to sit on the sofa, since there is the moving pull-out part underneath, but if I pull it out, it would probably fully collapse. This would most likely require to put the sofa upside down, detach the back cover and reattach the seat to the outside arm/armrest part, ideally also reinforce it somehow