Thanks all! Yes the galley, kitchen grey tank seems to be full. I don't think the valve ever worked. I have three valves and tanks, the black and the shower valve works but I usually pull the two greys at the same time and never noticed nothing was coming out... I'm really not mechanical - and it might be a simiple fix of just making sure it's attatched? DH might be willing to try to removing the underbelly but with a 2.5 year old kid, we might have the time or the energy. Any thoughts on cost of repair at dealer? Just curious.