We have a 2017 Big Country 3965 DSS. The large bedroom slide out is out of alignment. The top of the slide out is in but the bottom is out. The slide is a Schwintek. It made a clunking noise as it was being retracted. We are hoping it is something that can be easily fixed without spending time in the shop. The RV has been garaged for about two years. Next month is supposed to be our first trip in two years. Any help with a diagnosis is appreciated.