I was having the issue of the water coming out of the reservoir valve. I tried blowing air through the return valve, spanking my keurig, and everything else I could find on forums but nothing was working. I even called Keurig directly and they couldn't help. Turns out that there are 2 screws in the top where the needle sits that can be removed to take the cover off the handle so you can access the hose assembly. There is a barrel shaped pump that sits between the water heater and the brew basket that can clog up and creates the pressure backup that forces the water to be routed through the return valve back to the reservoir. If you gently remove the hose closest to the brew basket and squirt the descaling solution into the barrel and hold it upright for a couple minutes the solution will break up the scale allowing the keurig to fully cycle.