The roof panel of the slide runs from the outer edge back into the area that is covered by the trailer side pane. I would think the correct way to replace would be to pull the complete slide out. This would give you access to the whole roof panel and insure a good fit. I think using a Hi-Lo would make that job fairly easy to remove a slide. You could rent one for a few days and do the work yourself at home if you have the room. Or, spend the big bucks and let a repair shop have at it.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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