Kitchen slide leaning

[2 DA WDS]

When I bought my RE3 from a private owner he pointed out that when the kitchen slide came in it would 'rub' against the curb side slide at the top. I put a small cork pad on the curb slide and never thought much about it untill I noticed the other day that I could see the white plastic on the wall above the slide when it was out. It appeared to be about and 1 or 2 lower than it should be. I also noticed that when moving the slide in and out that the wallboard on the outside of the front (nearest the fridge) flexes while it is going in or out as if the weight of the slide is on the edge of it. I have come to the conclusion that something underneath the inner edge of the slide that is supposed to hold it up has broken or come out of adjustment.

Any thoughts or experience with this?