Mate you're a life saver. First Audi ever and I have exactly the same issue. On the entire interweb you are the only one that has gone through the same and posted the solution. Thank you!
I'm.a bmw guy so only have Carly but its showing up errors on the clutch pedal swtich, ABS and comfort access. Receipts show that someone had replaced the mastercylinder last year.
Now time for the dumb question. Where exactly do I find the ECU and the broken cable you refer to?