The Audi 'UK Assistance and Warranty Details' booklet provided with my car includes the following wording...
Audi warrants that it will rectify, free of charge, defects in materials and workmanship for a period of up to 3 years or 60,000 miles, whichever occurs first. The warranty is subject to the following terms and conditions.
There are then various conditions but the main ones include...
Types of damage not covered by the warranty:
Damage not due to defects in manufacture or materials - for example normal wear and tear - is not covered.
Nor is damage caused by improper handling or misuse (as in motorsport, for example) repairs, adjustments and replacements arising from circumstances outside the manufacturer's control.
Non-warrantable damage includes (but is not limited to) the following examples.
Fair wear and tear on items such as brake pads and discs, clutch linings, spark plugs and fuses, carpets and seat covers.
Mechanical adjustments to items such as brakes, clutch and door locks.
Window glass breakages......
Damage to paintwork, chrome trims caused by industrial polution, bird lime, climatic, thermal, chemical or mechanical influences.
Parts which have reached the end of their expected service life.
Defects arising from a failure to have the vehicle serviced in accordance with the Manufacturer's instructions.
So if a problem is not excluded by the above list and is a genuine manufacturing defect or fault it should be covered and I would personally argue very strongly about having to pay anything. I must admit that I have never been asked to pay anything in the past. With some small things it can sometimes make a difference if the dealer doing the work is the same dealer that the car was purchased.