My Mother's HR23-700 died yesterday, after a very long phone call with tech support they are sending her a new receiver the end of this week or the first of next week. Being a good daughter I took the receiver out of my bedroom (HR24-100) for her to use till her new one gets here. I have a very different set up than she does, I have whole home, internet and multi-receivers. My main receiver has the SWiM device. My mother has one HD receiver a dual co-ax cable from the dish that pluged into SAT1 & SAT2 and no SWiM device. When I connected my receiver I am receiving 771a error. I feel sure it has to do with settings but I have no idea where to start. Can someone advise me what to change?