Forgot to update this, but they replaced them under warranty. Now, the rest of the black trims have started to corrode but i'm out of warranty (car is a 2017 model), no damage to the tops (no stone chips) and they're ceramic coated, the corrosion is coming from underneath.
According to the Anti-Perforation T's & C's:
"Your new vehicle is manufactured with full protection against rust attacking the internal cavities from the inside to the outside leading to perforation. The anti-perforation warranty lasts for a period of 12 years starting from the date of delivery to the first owner. In the unlikely event of this occurring within the warranty period, your Audi Centre will carry out the required repairs free of charge. The following conditions apply:
● The defect must be reported to an Audi Centre as soon as it is discovered. This must, of course, be within the warranty period.
● The Audi Centre must determine that the perforation has stemmed from within the internal cavities and is the result of a manufacturing defect.
● The perforation must not have been caused originally by external factors such as accident damage, stone chips, industrial fallout or pollution, plant resin, animal pollutants, chemicals or insufficient care or maintenance.
All body repairs will be carried out promptly in accordance with the Manufacturer’s technical guidelines, using only approved parts and materials, in order to maintain the original level of anti corrosion protection"
The problem is, the T's & C's are vague and open to interpretation...i.e. what do Audi deem as the "internal cavity", is it the cavity of the main body or the cavity of the trims etc.
Has anyone had any luck with the 12 year anti-perforation warranty for the trims?