I removed the bottom panel from the back of the fridge, closed the water and unplugged the unit.
I removed the water supply line nut to the valve unit with a adjustable wrench, and with a Phillips head screw driver removed one screw holding the bracket. pulled the unit out and removed the two electrical plugs. To remove the two plastic water lines, there are two black plastic clips under the tubing connection which lock the tubing in place, .pull the two clips out,depress the plastic, and pull out the water line. take the new unit in hand, remove the plastic clips, depress the fitting and insert the plastic water lines, Make sure to push the plastic tubing all the way in until it stops, then install the new clips. reconnect the electrical plugs which only go in one way,install the new unit and reconnect the water supply line using the new nut, make sure to push the line firmly until it stops then slide the nut down over it and tighten. turn on the water and plug in the fridge and check for leaks, test the water dispenser for operation, replace rear panel . just a note, have a towel handy when you disconnect the water connections, you won't have any trouble.