While not Kodak Retina specific, I have been very pleased with the service I got from KEH. Two cameras for an overhaul, one of them also needed some repairs. I emailed for an estimate, mailed the cameras with an authorization up to the estimated price on a Friday. The following Wed. I got a phone call that the work was done, but their was a small glitch in the Credit Card info I sent them. That was corrected, the payment processed, and I had the cameras back in my hands by Friday. They actually did more than what I asked, and replaced some worn, but working parts on the camera that needed repair. ONE WEEK for CLA and repairs including shipping both directions. Both cameras work flawlessly.
VERY PLEASED. Not the cheapest estimates I found, but excellent service, and not at all unreasonable price.