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Leonard it could be several problems in the drain lines or valves. The plastic disc that they cut out of the tank to put the drain valves in have been found in the tanks and finally coming down to the valves and blocking them or that piece of plastic from the cutout has made it through the valve(highly doubtful though) and gotten lodged in the drain pipe creating a clog. Since it is the grey drains and you are not putting paper down them(hopefully) that is about the only thing it could be. racerjoe has another good idea-- if you do not know you have TWO drain handles for the grey tanks, you may be just full. Normally this is the galley tank backing up into the sink because the salesrep forgot to tell you about the second drain handle to clear the tank. IF you do not get any satisfaction from the answers here on the Forum and since your unit is a 2013 unit, I'd be taking it back to the dealer for them to find the problem under warranty!
Let us know what you find out!
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