How to raise a Norcold refrigerator door so the middle flap closes

Our Fuzion 429 has a Norcold refrigerator. The middle flap, between the doors, was rubbing against the bottom of the refrigerator and not closing all the way without us giving it a slight tug.

We tried clean the area where it was rubbing. We also tried applying a small amount of lubricant. Neither of these permanently fixed the problem.

The real fix is to simply raise the door slightly so there is no drag at the bottom. This is a very simple process. A small washer was all that was needed.