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Thanks Jim!  No debris at all on mine.  The slide is sagging in the middle to the point that I can see about 24" of light between the seal and the top of the slide.  I had the bar at the top of slide adjusted and at first it pulled the middle of slide up but seems to have stopped doing that.

Bill, I would look over the valance to see if the metal tongue is going above or below the slot. I say that because if it’s going extremely below the slot it could damage the seal, retainer etc.