DIrecTV tells me I should be able to replace my HR24 with a Genie HR54 without changing my dish or wiring. But when we tried to order the Genie, they said it had to be installed by a DirecTV technician. They couldn't explain why. I currently have multiple HR24s connected to a switch and an early HD dish. Can I in fact simply swap the HR54/HR24 units, or does the Genie require something else to work? DirecTV could not explain after 59 minutes on a call! Thanks.