That little screen that lies at the bottom of the bucket needs to be snapped out and the washer replaced. You have to unscrew the bottom, carefully remove the spring loaded lever, ( don't loose the spring) After fishing the lost rubber washer out of the hole, I used a screw driver or other similar item to pop the screen out. ( use care not to poke a hole in screen.) Next replace lever and spring and push the Star ended piece through the bottom and THEN fasten the washer. Replace all excess pieces and it should be fixed provided the washer isn't badly worn. This is the only way I know how to fix it after countless different web pages and searches.

This solution worked great. My issue was the coffee was coming out very, very slowly, almost a trickle. Once I took apart the valve and popped out the screen, i found the problem. The screen was plugged with gunk. A stiff bristle tooth brush and some dish soap fixed that. To reassemble add this to the steps.
First put the spring and pivot/plug assembly back in place. Do NOT put the washer in first. ( Trust me )
Flip the tank over so you have access to the inside, press up gently on the plug and you will see the button the washer needs to fit over. It will snap in place over this button.
Check with cold water to confirm a water-tight seal. Then very carefully snap the screen cover back in over it. It is a bit stiff, but with care it will snap back in. (DO NOT USE A SHARP OBJECT)
Confirm once more you have a good seal and then you are good to go.
I ran a batch of hot water through with a little, (1/2 cup) of white vinegar just to clean out any residue.
This machine is now like new in its operation.