All users on an IPO R10 have 1416 phones with a button module attached. One user's module stopped working. It seems to not be getting power - doesn't light up. We replaced the side car and power supply. Replaced the phone. Moved the extension to another port. Moved a working phone/side car to this location. In all cases, the side car is dead. Customer says they have checked power. Is there a way to disable a side car on a phone? Not that I see, but what else? Any suggestions?