Need to exchange sporadic TV box for working.

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@DLW7 wrote:

Have swapped out bad box with another box in my house.  Works fine with other box.

Need to replace the 6 x 6 x 1 little box.  Where do I call? Where do I go?

Malfunctioned for months.  

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take it and the power brick/cord to an Xfinity store. what issue are you having? does it have a voice remote? if so use command 'about' and reply with the rest of line to right of STB Version.