We have a 28' Coachmen Apex. This is our 3rd summer with it. While out camping last week, we turned on the air and after awhile it began to smell like sewage in our trailer. The black and gray tanks were both closed. I felt like the smell was the worst when I would open the bathroom sink cabinet. I have a hard enough time running the air because it is loud and now with this smell, I really don't want to even turn it on. I faintly remember this happening last summer too. Please help!
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