Discovered a rear corner of the slide out had a soft spot.
It was damp when I found it. Not wet, just damp to my fingertips.
I pulled off the damp OSB that was rotting, so it has been at it for awhile.
The area was about 6 inches wide and 12 inches in length.
I had repaired the roof of the slide out about 10 days ago so I think this dampness was left over from that, at least I hope so.
I dried out the area, sprayed it with bleach water and dried it again.
A trip to Ace Hardware and 20 bucks later I was ready to patch the area.
I placed a cement block on the floor above this area.
My fix was to rip a scab board a 1 1/2" wide by about 15 inches long. The board is 3/4" thick, it fit perfect with the OSB.
I screwed the scab board in place.
I cut a 6"X16" piece of old flooring.
I placed that up to the damaged area, and then filled the void with expanding foam. I placed the board against the flooring then glued and screwed it into place.
I sealed the board with SticknBond and the edges of that with Dicor.
It looks waterproof, and if there is still a leak, I can feel inside on the carpet to see if it is damp.
Hopefully this takes care of the problem and I did open and shut the slider a few times and the repair job does clear the area it slides into. The DW helped as she pushed the slider button....