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Certianly sounds like your overboosting.
Did they drop the motor for the service? Sounds like something might be disconected. There's no such thing as a "chip" for our cars since we still have a mechanical fuel injection system. If the dealer is implying your boost is too high because of a chip, then it wouldn't surprise me something was left disconnected (ie...they aren't familiar with the car).
The quickest way to check the boost is to get a gauge at a parts store. Tap into one of the lines from the throttle body or the one from the wastegate to the intercooler and get a boost reading. You can run the hose through the sunroof or window to do this quickly.
Overboosting can be bad. A friend broke "all" his piston rings with one overboost. Be glad your protection kicked in!
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