The K20 is back after its second repair in the last four weeks. The first time the SD card reader wouldn't read, so they replaced the SD card holder and the main PCB/FPC, and updated the firmware. This time they replaced the sensor and (again) replaced the main PCB/FPC and (again) updated the firmware to solve this problem:
It's working, now, but... they don't know what went wrong either time and can't predict if/when it will all go south again for the same or other reasons. I have only a few months of warranty left and I'm not crazy about running down the warranty while waiting for the other shoe to (possibly) drop.
They also suggest calling Pentax and seeing what can be done.
Does anybody have any experience with Pentax replacing instead of repairing a faulty camera body? I don't want to get stuck with an expensive paperweight, and this is starting to suck all the joy out of photography,
Brian