It is possible that your kitchen drain pull handle may have worked loose and come away from the tank drain valve. On our unit, the tank pulls are threaded aluminium rods. One threaded end is for the handle, the other for the tank valve. Your galley/gray pull handle may have come unscrewed and fallen off.
We have 3 drain pulls - gray (shower and bedroom sink), black (toilet) and gray( for the galley) - all of which have drain pulls.
Your pull is probably located in close proximity to your kitchen sink - on the driver's side.
If you can't see a pull in this area, can you remove enough screws holding the black plastic coroplast underbelly and open up that area enough to shine a light inside there to see a tank valve and/or tank?
If you put some tank deodorant/chemicals down the kitchen sink, that might help to reduce or eliminate the smell until you can locate the tank and/or valve.
Let us know what you find.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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