Not too long ago my wife posted about our experience with several repairs at Elite R&R in Harrisburg, OR. During that time issues were addressed on all four slides, one of which had to do with a sagging curbside slide. The slide was not visibly misaligned when we brought the coach in, however the roller was leaving marks on the tile floor. It was determined that the roller had been excessively tightened in the past and one of the bolts had broken, causing the roller to be dragged across the floor leaving marks. After the roller was repaired and adjusted to the proper tension we noticed the slide was misaligned in the opening. When examining the attaching slide hardware it was determined that it had not been properly installed at the factory. Bolts required to pin it into final position were not installed and over time the slide sagged. It seems the excessive pressure on the roller was a previous attempt to adjust the slide position. Once the slide was jacked up and the additional bolts installed it sits square in the opening. BTW, the area where all this work had to take place was at the rear side of the slide, which was not an easy place to work. Elite did the work, not us, so I don't have more step by step specifics.
So, your problem may be solved by adjusting the pressure on the roller, however, there are other components to consider in the mix.
Dan & Arlene
2005 Monaco Dynasty Diamond IV
Chasing the good weather