I have a tivoHD and a Tivo premiere both with lifetime. My TivoHD is on the blink and I need to replace it. I see ads for refurbished Tivo Premiere for pretty cheap (less than 100, service required but no contract required to "buy"). If i buy one, can I call up tivo and swap out the lifetime tivoHD for the premiere? I am pretty sure if I get another tivohd they would probably let me swap it out, no?