I have a question about DIRECTV HD DVRs. I currently have an HD DVR, 2 HD receivers, and 2 SD receivers. I am considering replacing one of the HD receivers with another HD DVR. I am wondering what this would require. Would there be a service call required? Will there be any new monthly charges? (I already have the multi-room DVR service.) Will I need to agree to another contract? I am also wondering if they charge the full $199, since I already paid $100 for the HD receiver a while back. I will call them eventually, I am just curious if anyone else has done this before and what the procedure was so I know what to ask DTV when I call. They usually are more interested in selling me stuff than answering my questions (after keeping me on hold for a long time of course), so I want to be prepared. Thank you.