I know this thread is about 3mo old, but I'm new to the forum here and thought I'd offer a little of my own experience. I had to have a Pentax Optio S1 repaired earlier this year under warranty, and I sent it to:
Quote: Camera Repair Japan
3435 Breckinridge Blvd, Ste. 130
Duluth, GA
30096
770-935-9771
Nice folks to deal with, generally speaking. My camera apparently needed a replacement lens. Parts shipped relatively quickly and the camera was physically R&R'd pretty quickly. There was a significant (2mo+) delay while they were waiting on the software required to calibrate the lens, but I called Pentax Customer Support at the time and confirmed the software was not available in the US yet. Not sure how the cameras made it here and were for sale for a while first, but it happens. I also called CRIS to ask if they would be able to calibrate the lens and was given the same story. Again, I'm not sure what the holdup was, but after about 3mo, I received my little P&S back in fine working order and it's given no more trouble since then - and we've taken 3500+ additional pictures since its return.
Maybe this is helpful information for anyone looking for a service center closer to the east coast, as these folks are in the Atlanta area. I'd call them first and confirm you won't run into any delay issues, but it's worth a call.