Front axle action for the A8 of the first years of construction

On the occasion of a workshop stay, an AUDI customer service master told me about an action to renew all axle handlebars on the front axle of the A8 of the first year of construction.
I learned about it after all the handlebars at the front left and 2 handlebars at the front right were renewed at my expense.The handlebars had false materials on the joints. i.e. Misconstruction.
Who knows anything about this action?
Another AUDI partner said that there has never been a front-axle action for the A8.
But there was one for the A4 of the same years.
What is right now and what can I do?

I'm grateful for every clue.

Welcome

Gerd