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[davidaf]

You should have two grey tanks, one for bathroom, one for kitchen sink. Second grey tank valve is locate just in front of the drivers side tires on the frame (lots of people miss it, me included). If you don't have dual bathrooms the second black button may be a fluke. There was another thread started a few days ago on the same second black tank light. Not sure of the outcome but I'd contact the "owner" of that thread or post a reply in that thread for their outcome.