We are getting a bit off topic, however the difficulty is because there is NO DCT service as one item.
There is DCT cannister replacement (filter) and DCT fluid replacement and these are separate items following separate schedules.
So other than Cannister replacement at 12,000 km:
The DCT Fluid: Check the dual clutch transmission fluid life percentage OR 72,000 km OR 3 years whichever first so some of us low mileage owners, will be every 3 years. The DCT Cannister: replacement is 36,000 km
Since for some of us the DCT fluid change will be more frequent, just change the cannister at some point when you do the 2nd or 3rd fluid change.
Now, why this DCT fluid has such a short life in a Corvette as compared to 12 years in Porsche, BMW Mclaren etc etc I have been trying to find out but no luck.