Thanks guys.  This weekend I'm going to try swapping the receivers, but I've been looking around and think its time to upgrade everything to hopper.
My account has 3 VIP receivers on it.  1 622 in the garage on its own 1000 antenna, and the 622 and 722 on the house 1000 antenna.  As I understand it I have to upgrade all 3 to hoppers as dish won't allow old VIPs on the same account with hoppers.  So do I have to replace all three receivers simultaneously and then call to remove the VIPs and activate the hoppers?  I'm going to wait to add joeys for some extra TVs later.