Hello out there,
we just experience the same issue with two new us2000c in our Solar Boat Project with Victron EasySolar (charger/inverter) and ColorControl GX.
The firmware version and/or settings on the Victron side allowed for too high charging voltage and both pylons are now locked in alarm mode (red light and buzzer).
Our supplier works on a solution with the Pylon importer, but he suspects the bms boards need replacement.
I‘ll update you when I know more.
Cheers, Sebastian