Got my D600 back from the repair facility yesterday, March 31st. I had sent it on Friday March 7th, with the label I downloaded and it arrived in LA on the 12th. Notes on the Invoice said Service Repair Rank B2, RPL Shutter Mechanism, Ckd Communication,Ckd Shutter Release, Low Pass Filter, Firmware Upgrade, General Check & Clean.
So far the camera appears to be in great shape. Today I got a follow up call from Nikon apologizing for not having contacted me after the camera arrived at their facility -- something that I hadn't know they were going to do anyway, but it was good that they called. (DP)