Having spent an age up under the dash of the A6 I've got fairly good at getting to fixings you can only feel rather than see! Wonder if taking the RNS-E out would improve access or if it would be too low?
Ref the code, although I know the unit was a factory reconditioned one bought from Audi and I have the handbook, it was only a couple of years after buying the car that I realised the code isn't in the front of the handbook and should be on a separate card, which I don't have  I'm sure I can get the code via my local dealer, but it's obviously less hassle not to need to.
Don't have VCDS etc due to cost - mine has never thrown a code apart from a faulty ABS sensor and the F125 switch, and I got those read locally for free. I will invest at some point but to change a bit from 0 to 1 I can hopefully get someone to do that for me  Let me know what you'd want for your old cable 
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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