This problem has been reported by others as well so you are not alone in this.
If your leak is coming from the bathroom, it could be that the vacuum breaker or anti-siphon device in the flush system is kaput. Try looking under your bedroom/bathroom sink for this or it may be hidden behind some removable panel somewhere -- it is usually right in line with the exterior black tank flush.
If you do a forum search and type in "black tank flush", you will find pages of posts and there are numerous ones with what others have done to find and correct this problem with the vacuum breaker or with the black tank flush. This issue has been discussed at great lengths on the forum and there are literally pages of posts about this very topic.
If, after browsing through the posts, you can't find any fixes in these posts, let us know and we will help you out.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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