by the law
the dealer should not take a look in your computer unless you authorize it.
i have several works done in the dealers, including to change all my brembo exterior becouse paint fail, oil changes, tire rotation, recalls, etc,
as far you don't go there *****ing becouse you blow your engine or tranny, they don't have to take a look to your ECU or mods.

 

And how do you know this? A friend of a friend, who's brother's cousin works at a VW dealer.