What's really frightening is that the dealer couldn't replicate the problem, when infact there is nothing to test for. Indeed this is normal behavior for automatic transmissions. I might also add that I believe it's covered in the owner's manual AND has been covered here many, many, many times.
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ChuckH
"Every morning when I wake up I know it's not going to get any better 'til I go back to sleep again!" Al Bundy