I have no tried him yet, but here is an independent shop:

http://pentaxs.com/

I have had my Pentax 6x7 and TTL prism refoamed and CLA'd by a local Washington, DC repair shop - ProPhoto on I Street, NW and they did a great job with it.

I have also had a Pentax 645N body overhauled by Pentax in Colorado. I bought the camera as a salvage unit (dropped) and had them put in a new shutter assembly and they re-calibrated everything back to factory specifications for a reasonable price and very fast turnaround.