Audi A6 C6 2.7TDI Problem found! Hose damaged!
Last week I fitted my roof tent so we could go on vacation this last long weekend, and then, when I drove the Audi out to load it up I saw coolant on the floor.
To me it looked like the EGR cooler was leaking, but luckily it's just the hose from the EGR cooler that's broken, so organize new hose and then the problem should be fixed.
But accessibility is something else!!!