Verizon FiOS TV → Re: [DVR] DVR Noise

I would not open it as the DVR is still the property of Verizon. If you damage it, they will hold you responsible.

Cautious opening is fine. As is various attempts to remove dust, etc that may be screwing things up. You can get the outer cover off fairly easily, but don't try and remove some of the rest as that will easily show as tampering, and could get you blamed for any damage.