Z4 3.0Si Auto box noise in down change.

I have a 2008 Z4 Coupe Auto when I down hit the kick down say going up a hill I get a loud screech. At first I thought it was a one as it didn't do it that much now it is starting to do it more often. I am thinking it might be so with the auto box its only done 20,000 miles. Just thought I would ask as any one else had this problem?
 
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