I have a 501 that is having some problems and I would like to do the swap out before it dies. I have a 722 and 1000.2 dish and would like to swap the 501 to the 612 receiver instead of the SD receiver. I did sign a 2 year contract over a year ago to get the HD for life package and would sign a new contract if necessary. I have been a Dish Network subscriber for about 11 years and pay over $100.00 a month for service. I also have installed over 1,000 Dish Network systems, so sending a tech would not be necessary.