Make sure water is turned off to valve
Using nut driver remove rear cover screws.
Remove bracket holding water valve (2 screws).
Have new valve handy, remove plastic tubing from old valve, by pushing down on plastic retainer, I used a pair of needle nose pliers. You just need to push down on plastic retainer from both sides, not crimp the hose. Tubing should pop free - push tubing into new valve using the same location it was removed from, you will feel it when it is seated all the way into new valve. Retainer will pop out and hold it into place. DO the same for remaining tubing.
Remount new valve with 2 screws.
Before replacing rear cover, turn on water and test for leaks and valve function.
Replace rear cover. Slide Refrigerator back in place.
For the truly paranoid place a piece of cardboard (long - so you can pull it out from the front) under the water valve to double check for leaks after unit is in place.
No water on cardboard after a few hours, repair complete