Perhaps I'm just showing my ignorance here, but what specifically are you trying to accomplish? How are your STB's malfunctioning? Are you unable to get past the black screen, the red screen? Are you missing channels, Guide, On Demand, multi-room DVR functionality? Or are you just having trouble getting them to show up in your account?
If you are unable to get past the black or red screens, it would sound like you have lost your feed. Supposing that your TV services have not been cut off on Verizon's end, I would check the main coaxial cable line between the ONT and your main splitter, and the connections leading out of the main splitter. Make sure the line is not kinked or damaged. Make sure that the pin inside the connections is undamaged. Make sure the connections are clean and tight. Another way to trouble-shoot is if you have a small TV, take it and one box out to the ONT and connect up from there. This would let you know if the problem is in your house.
If I'm off target here, please post back with more details.