Dealers have no say in what is covered under warranty. They try to discourage warrantied repairs because they can't gouge you for the work.I propose that we play "six degrees of Kevin Bacon" whenever we get a "my xyz broke, is it covered under warranty because I'm tuned?" question.
This fellow AC issue - dealer or elsewhere? | GOLFMK7 - VW GTI MKVII Forum / VW Golf R Forum / VW Golf MKVII Forum just asked about his AC. My first reaction was "there is no connection" but later I thought "is there a scenario where a tune could affect the operation of the AC?" It clearly depends on what was "tuned", but I'm thinking that we could give more comprehensive answers if we said "Unrelated, however if...."
Dealers are becoming even more risk averse these days and I think we should point out unintended consequences - no matter how farfetched it may be.