Replace the damper control assembly. It took only about 10 minutes. However, when replacing the damper control assembly I realized how dirty my refrigerator was. This led to my removing and cleaning every shelf, rack, drawer, etc. and washing and cleaning everything. I even found a couple of science experiments going on in the refrigerator. Cleaning the inside of the refrigerator led me to clean the stainless steel surface with a stainless steel cleaner. The 15 minute repair turned into a 2 hour project, but my refrigerator is now quiet, sparkling clean, and smells like roses... as good as new!