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It has an AAV under the bathroom sink. I will have to remove it and see if it helps it drain. I will have to wait until we are camping somewhere to try leaving the dump valve open. Thanks.

I recently purchased a 2012 Cyclone HD 3612. When using either the bathroom sink or the shower, I find that the drains for both are slow to drain. I removed the p-trap under the sink, but it was clear. Both grey tanks and the black tank were empty. Tank levels do not change the slow drains any...