QU24 USB issues

Hi all

I’ve got a QU24, with a USB connection for streaming audio from a PC to the desk. It was all working perfectly, until the desk got PAT tested. Now the USB-B will not recognise at all. I’ve updated the firmware to latest, I’ve tried different usb ports on the computer, different usb cables, different computer. Nothing has worked.

Any suggestions? Anything obvious I have missed? Or is this a USB board issue in the mixer? I bought it second hand so no warranty. How expensive could this be?

Thanks