This computer is configured as a bridgehead server for 1 routing group connector(s) in the organization. These must be moved or deleted before Setup can continue.
Recommended Action: http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.12&id=b35c4602-e6c4-4fcc-873c-31f80a2582e1
get-routinggroupconnector | ft name, sourcetransportservers, targettransportservers, guid
This will enumerate all routingroup connectors.
You can remove them by using the remove-routinggroupconnector <name|guid>