How to Adjust Slide Height - '18 Alante - Water Leak

[cfisher523]

So I found the root of my water entry on slide retraction. My wiper seal does not make contact on the rear portion of the slide. The bulb seals make good contact when fully extended or retracted, but if water is on the top of the slide is comes in with the slide because of the lack of contact by the wiper seal. so....

Does anyone have experience adjusting the slide height? I hate to take it all the way in to the dealer if I can tweak this myself, but I haven't worked with this type of slide assembly before. I believe it's just moved out of alignment as we didn't have this problem until recently so something has changed. Any info, advice, words from experience, etc. are appreciated. Thanks!