the noise is most likely from the strut bearing...had mine replaced and noise is completely gone now.
How did you find out which strut bearing it was (front, rear, left, right)? And I'm assuming you got it replaced under warranty? This kinda thing is random so I know the dealer would have a hard time replicating it.
Sweet - if I could figure out where the sound is coming from, I'd like to fix mine, too. More info would be appreciated if you can remember (i.e. part name/number, write-up maybe?).