Depends on the store and the personnel.
I have had a particular store replace the 'digitizer' and not charge me a thing (I have TEP).
Then 2 months later, an app downloaded from the Android Market made my phone wonky, and they tested the phone for 2 hours and handed it back with the number of Asurion telling me "Android is open source and you can't trust every app in the Android Market, even the ones Sprint Approved".
Needless, to say, i then searched the forums and found a solution.
I say try different Sprint Owned stores with service centers and see how it goes!