Difficulty

First, open the door of your unit and remove the top wooden shelf.
Locate and remove the two screws behind light to free the display.
The display panel should be able to pull out fairly easily.
Remove the display board from the display case secured by 4 thin tabs. Do not use excessive force as to not break the tabs.
Disconnect the wire from the unit.
Insert your new display board in its slot. Make sure the springs are in position and the tabs secure the board. Don't forget the reconnect the wire to the unit.
Tuck the wires in the display casing and slide the display panel back to position.
Tighten the display panel with the screws removed from step 2. Place the wooden shelf back.