Well my Q5 is at 99k miles at the dealer right now for almost 2 weeks waiting for audi to decide if they will cover the chains. The first thought from the dealer is that the service code for the chains does not fall under what is covered by the extended emissions warranty. However when I looked at the TSB that is the 2nd link below it has a service code of 1390 for the "balance shaft chain". When I looked up the factory service manual (erwin) the diagrams show that the only chain that touches the balance shaft is the main chain that also drives the cams.
Also I always like to remind them of page 9 in the extended emissions warranty booklet where it says "Conflicts concerning the warranty are to be resolved in favor of the consumer".
My advice to anyone who has the timing chain rattle issue is:
1. Get as many videos of the sound that you can so that the dealer can't say the sound doesn't exist. A cell phone video camera works great.
2. Have the dealer diagnose what the issue is.
3. Then if audi tries to deny the repair. Go to the 1st link below and get a copy of your warranty booklet and remind them that you are the consumer.
This worked for me when I had a leaky valve cover gasket. Although I had to fight through audi customer care. If that fails get the class counsel attorneys involved, because this is not just any warranty that they can deny it is part of a lawsuit settlement.
https://www.vwcourtsettlement.com/en/3-0-models/
Then look under "Approved emissions modification" and choose your engine version.
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144659-9999.pdf