My 2004 had the very same cracks on the inner lights once the car was 6-7 years old. I suspect it is an issue with UV causing deterioration but it is disgraceful for such an expensive car. I intended to change all 4 rear lights for facelift ones but couldn't justify the cost of them at the time. I tried a warranty claim with Audi but they rejected it on the age of the car. They didn't get any worse if it's any conciliation.
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