It's a fairly easy fix although the first time you adjust slides yourself it seems a bit daunting. Or was to me, anyhow. Once MIMF showed me how to do it, I figured out it's really not difficult. There are a couple of things you can do to make it easier.
First, read the manual and follow the instructions.
Second, start by moving the slide partway out, maybe half way. I think the manual mentions this so use what they say.
Third, as you turn each bolt, count the number of flats you turn it. That way you can always get it back where you started. If that makes no sense, a hex head bolt has six flats on the head. I have to write down the number or I'll forget.
Fourth, once you have moved the bolts to where you want to try it and tightened the locknuts, stand up and shake the heck out of the slide so it moves to the new bolts position. Yes, it will rock the trailer. No, it doesn't hurt anything. This is the key that MIMF showed me.
Fifth, close the slide. If still not right, do it some more.
Or, as Tom said, if still in warranty, see if the dealer will do it. However, I believe slide adjustment is only covered by warranty for the first 90 days of ownership, if I recall.
Doing this was scary for me the first time. I was afraid I'd really screw it up and then have a big problem. That didn't happen. It's really not difficult, with the help of the manual to know what bolts to change. You can figure it out by looking but it's comforting to have the manual.