I have been seeing TV spots for Free Whole Home DVR upgrade. Whats entailed in this? I see in the fine print on the screen this; "Limit 1 remote viewing at a time. Requires 1 HD DVR & HD receiver for each additional TV. Additional fees apply." So for instance I have a HR20 and HR21 and R-16 on a SWIM with the 8 way splitter (not the big SWIM splitter). What would they change out? Thanks!