How to get a REPLACEMENT cable box

Thanks for the reply!  

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@Fraaqman wrote:

My current cable box is not working, but all the routes I've tried lead to RETURNING the box (as in returning and canceling the service), not REPLACING the box? Can I just go directly to a comcast service center with this box and ask them for a new one? 

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When I needed to change out my cable box, I took it to a local Xfinity/Comcast store.  It was swapped out with an upgraded one with no issue and no charge.