Hi,
Just joined. Very similar issues to most of the posts on here. I had the update / fix applied 6 months ago. I did notice that the regen was kicking in more often but told it was normal by the dealer.
Took the car for a 60k mile service and the engine warning light appeared 3 days later, I have asked Audi UK to comment via the Trust Building forms but they haven't responded. I did ask for the name of any independent specialist that would be able to inspect any parts that are subsequently removed to ascertain if the failure could be attributed to the update, possibly be the reason in the delay in responding. The dealer seemed to be physic and told me that a repair was going to be expensive even before ant diagnostics have been carried out!
It would be interesting to see any data that Audi UK hold to see if they have a trend in EGR / DPF faults on those vehicles that have had the EA189 but unlikely share i suppose.
I decided to take mine to an independent Audi specialist, half the price for the diagnostic and if I decide to go ahead, £600 to replace, he was keen to advise that Audi do insist on the work been carried out by an approved dealer to pursue and claim under the trust building thing and left the choice with me.