Slide Adjustment

I found a hairline crack in the gel-coat running at an angle up from the upper front corner of my off door kitchen slide. I have also noticed that there is a "roller mark" in the laminate floor from when the slide is closed. I am assuming that the slide is out of adjustment and that is what caused the mark in the flooring and also the small about 6 or 7 inch crack in the gel-coat.

My question is, how complicated is it to adjust a large slide and about what should I expect to pay to get it done. As for the fiberglass repair, I use to have a boat and think I still have those guys on direct dial. I would appreciate a ballpark figure on the slide adjustment. I was thinking about having all three of the slides checked and adjusted as needed at the same time.

Thanks in advance.