Corsa Audio System Failure

That's a pain! Is the entire unit dead, or just no sound? Does the display light up? Can you select radio stations or USB audio, but hear nothing? If so, it might be a speaker issue. Otherwise, it's the head unit, a pricier fix.

The display works fine. I can change radio stations and select USB audio. All the lights are on and the digital functions work. The sound is just gone. Does that point to speakers?

Yes, it sounds like a speaker problem. Given it's all-or-nothing, I'd suspect the bass speaker has gone, killing the amp somewhere, cutting the signal to all the speakers, like a short circuit protection thing. See a professional mechanic.

I took it to a local garage. The bass speaker was indeed buggered. Total cost 280€ including the new speaker and fitting. Cheers!