3051 slideout adjustment?

[dcogs15]

I have a 2013 model with about 10k miles. Noticed last year that the slide flange-to-body gap is wider at bottom than top when the slide is in. Bottom gap is about 3/4" wider than the top and no/slight contact with the bulb seal. Bulb seal is slightly compressed at the top. Is there a way to adjust the gaps? Or is this a job best done by a dealer? I've tried holding the button a few seconds after full travel (in and out) as recommended in owners' manual with no improvement. Has anyone else had similar situation?