Ok, so it seems like the usb and the aux-in cable go to a USB hub (part number 84 10 9 200 503) which apparently is under the console, that hub connects to the fiber optic circuit.

This would mean that either there is a fault with the wiring to the USB hub or there is a fault with the USB hub.

Can anyone confirm if this is correct, how to test if the hub is at fault, if so, where exactly is the hub located?

Thanks again!