Ridiculously easy repair!
The Airport Extreme card just stopped working. It was obvious that I needed to be replaced.
The repair went very easily once we read the iFixit repair guide. It was a very simple and easily installation.
DON'T USE APPLE'S REPAIR GUIDE! It is overblown, complicated, and ended up being just plain wrong. I believe they do this to encourage end users to take their item to the Genius Bar. Always use iFixit's guides. They are simple and don't require any unnecessary work.