I have a 2018 Thor ACE 27.2. What is considers mid-gray and rear gray on the control panel? I never get anything from the gray valve next to the black valve. Those are behind the rear tires. The one gray valve in front of the rear tires is the one that’s dumping my kitchen sink. Is there really (3) holding tanks? (2) Black and (2) gray? Or only one gray? I’d appreciate an answer. Thanking you in advance.
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