Loud high pitched undulating whining.

We have put up with this noise for several years and finally couldn't take it anymore. After research on the internet and reading about other folks solving the problem by replacing the main board, I ordered the main board and replaced it. That was a week ago. It has been a week blessed with SILENCE from the refrigerator. Hallelujah!!! It was an easy (if expensive) fix and the instructions were spot on. Anyone have a use for a defective main board?