I found the repair document online...I think here somewhere? It's fairly extensive. I think they ship a kit to the dealers and they do it. I took delivery last night of a CGTS. The recall had been done...and also the side vent thing that keeps foreign matter out of your air filter box.
The procedure includes a lot of rust-proofing prep around the holes that need to be drilled. I was happy to read it.
I'm liking my dealer. They're not cheap, but they know the cars and know what they're doing. At least you get something for all that money!
There is a stop on new orders until they equip the factory to solve this on-site. The extra labor on all these 718's is expensive.