I just dropped my Model S off at the Dallas service center this morning for the "UV Repair". They have a one machine and TWO other Teslas are ahead of me in line to get it done today.
A Model X was getting the treatment when I pulled in and I actually got a glimpse of the machine. It looked like a red box about 2 or 3" thick and the same size as the 17" screen, attached to the face of the screen. The rep indicated they had done a lot of them and were even doing this pro-actively on cars that were in for other issues, where THEY (the Tesla reps) noticed the issue even if the owner had not yet reported it.
The rep indicated it takes about 2 1/2 to 3 hours and indicated that my car SHOULD be ready today (albeit late I assume).
No loaner for me today - Uber credit instead (note: I've had a mix of Tesla loaners, Chevy rentals and now Uber over the years). They did send me an automated text early today before the appointment to indicate they were unlikely to have a loaner and would provide the Uber credit (up to $100/day...does not cover tips). For me, the Uber credit is basically fine and worked seamlessly to get me home from the service center.
For all the grief Tesla service gets, I have generally been WAAAY happier with them over the last three years than any other dealer repair shop I have experienced in my life.
Will report back on the results of course!