My Flex-6600 arrived Friday. Saturday night some fan noise developed and has stayed. It is coming from the right side as you are looking at it. Has anyone else had this issued and solved it? Here is a link that to listen to it. https://youtu.be/UN-wCMqzCK4
There's another thread here about the same issue. Turned out in that case, that there was a cable for the fan that was not properly secured and was being hit by the fan. Contact the Help Desk tomorrow and they can help you resolve this issue.
Dan, your issue is probably what James described above. If you are willing to do so, you can remove the cover and inspect the fan. If the dark CAT6 cable is brushing against the fan blades you can relocate it so it does not impede the fan. Otherwise, open a HelpDesk support ticket.