I flashed the car back to stock and locked it, as I had to bring in the car yesterday for a DCT issue for which the dealership needed to do a data read-out. They upgraded the car to the latest DCT software version and either didn't notice or didn't mention anything about any tuning/coding.
So, from personal experience, it seems that for a random check/software upgrade you are unlikely to have any issue with the dealership.
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