It's not too hard to fit the replacement:
1. Pull off the front knob. Levering with a screwdriver may help.
2. Remove the 4 top and 2 side screws on the stainless steel lining behind the panel. You should now be able to make the panel fold down toward you.
3. Cut the cable tie that holds the black wire, and untwist the plastic wire holder so the wire is free.
4. Remove the two screws holding the control box (one on top and one at the front). Pull the control box away from the clips and carefully let it dangle over the top of the door.
5. Use pliers to squeeze the base of the plastic wire holder so it comes free from the old panel. Then clip it into the new panel.
6. Do the reverse to install the new panel. If you don't have a new cable tie for the wire, use a twist tie.
Mark, May 2015