rodl
Established
I had this issue. I heard all the ideas listed above from Pixel Fixer to automatic fixes in ACR to it requiring a sensor replacement. None of the software fixes worked. Called Leica NJ and they said send it in. They did not replace the sensor but they did fix the problem as well as doing a nice CLA. Cost was about $450 and took about 7 weeks. Don't expect to get much info about what they do to it as I asked the same questions and got non-answers. The guy who originally sold it to the guy I bought it from also called them to see what he could find out as he had been in the facility and worked with one of the techs. They told him they couldn't tell him anything since he didn't send it in. They're not real good about giving out info.