Modem damaged while xfinity repairing service outage

There was a sizable internet/tv service outage in our area Saturday evening that lasted for 5+ hours, affecting at least several hundred customers. Our customer owned voice/data modem was working fine before the outage and even during the outage it was functional/user interface accessible but didn’t have a data connection.  About half-way through the outage we checked the modem and all the lights were wildly flickering/fluttering — not flashing, flickering.  Unplugging/re-plugging it, holding the reset button, disconnecting the coax, etc doesn’t resolve the issue. I chatted with Netgear support and they said it sounds like a hardware failure, more than likely due to a surge.  The modem’s power is connected to a surge protector/battery backup system so the surge had to have come through the cable line while the technicians were repairing the outage.  Wondering how we go about submitting a damage claim for our modem that was damaged by the outage; it’s less than 2 years old but not under manufacturer warranty anymore.

Thanks!