GPIB-USB_HS forgetting its hardware ID

My GPIB-USB-HS has not been used in the last few months.

Now when I connect it to the computer it is installed as an "Unknown Device".  Windows Device Manager says the device ID is USB\VID_04B4&PID_8613 which is the default ID for the Cypress USB chip:

USB Boot Methods
During the power-up sequence, internal logic checks the I2C port
for the connection of an EEPROM whose first byte is either 0xC0
or 0xC2. If found, it uses the VID/PID/DID values in the EEPROM
in place of the internally stored values (0xC0), or it boot-loads the
EEPROM contents into internal RAM (0xC2). If no EEPROM is
detected, FX2LP enumerates using internally stored descriptors.
The default ID values for FX2LP are VID/PID/DID (0x04B4,
0x8613, 0xAxxx where xxx = Chip revision).

So I2C communication to the device (EEPROM (?)) with the correct USB device ID would appear to have failed.

Does anyone know which component holds that information?  Does that come from the custom NI BGA device (U2)?? Or is there an EEPROM on the board that I've missed?