I would try to find a ladder and look at the top of the slide on the outside and also look on the inside of the slide at the top. It is alway possible some contruction debris or even a lost screw driver was rolling around up there after manufacturing and now it is jamming the slide.
The other thing can be torque on the wall causing it to bind. I have seen coaches slightly shift as the jacks sink into the ground of the base is not solid. I had that happen once on my Outlaw 29H. I tried to retract the slide in the moring after it raid overnigh and the slide would go in an inch and stop and bind. I could not get it to come back in so I manually adjusted the levelers and then I was able to retract the slide and never had an issue with it again.
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