How does pixelation relate to RS errors?

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I recently got Verizon to install an M-card in my Tivo HD. The Tivo has been working without problems for about a week. Tonight while watching an HD recording of Two and a Half Men I saw several places in the show where there was minor pixelation. I played the program several times to verify that it was there. I have never seen pixelation while watching live tv.

I went to the DVR diagnostics section to look at the statistics for both tuners and I saw 0 errors on both tuners for both RS Corrected and RS Uncorrected errors.

I'm wondering if the pixelation I saw should have resulted in these error counts not being 0? If the pixelation should result in RS errors, how could the pixelation have occured if there were 0 errors?