Take a close look along the parameter of the top edges, all the way around. The stress of the slide going in/out can loosen the seal of the joints. Some coaches also have a top metal angle piece, where the roof and the sides of the slide come together, and the seal along those can pop loose too. (Ours top and bottom angle pieces, have had the riveting and resealing process done, about 6 years ago.)
If it helps, we had our corner seal/caulking, black in our case, spring a leak this year. Took me two tries to find it, and we had water in our wood pieces and also running down the side of the slide into the corner of the carpet. Ours happened to be on the front furthest from the side of the coach slide corner. I did not want to use EternaBond on the area, and normal tape had a hard time sticking to the sealant/caulking they used at the factory. I finally found some Flex Seal Tape at a hardware store, and cleaned back a goo 8" onto the roof from each side of the corner. And and ran the tape along the full area, and up onto the about 1" side of the slide that protruded above the slide roof top. That stuck pretty good, and then I even went another 6" or so beyond where I feel the leak was, and used overlapping gorilla tape attached to the Flex Seal table. Almost a full 16-18" square of tape, working it's way away from that front leading edge corner.... Kept us dry until Premier RV Service visit, and they fixed properly.
We used heaters for days in that corner, to dry the both the carpet and the wood. I also pulled the puck lights down out of the wood overhead cabinets, to allow the area to breath. And used the wires Hair Dryer to up into the puck light holes, to do a more rapid drying. Finished up with a spray of bleach, to knock out any mold or dry rot from starting up. We were fortunate, as though we did get a small area of water leaching thru the wood, once it was all dried I used Howards Finish Restorer, and then followed up a few days later with the Howards Wax & Feed (Think that's the name.). I know where the area was, but it's 95%+ back to normal, and most people would not even notice it...
Pure luck, that I was sitting in the recliner reading a book, when is started to hear a 'drip, drip' sound that was new... Once I determined what was going on, I pulled the slide in for the rest of that days storm. So we prevented too much water damage from occurring...
Best of luck to you, and let us know what you find out, as it could help others in the future!!
Smitty
04 Allure 31017
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07 Country Coach Magna Rembrandt 45' ISX600
Roo II was our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
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