The green line is supposedly due to a hardware defectLOL seems pretty clear actually. And sorta cool to follow the thread of quotes to sort it out. He could just not reply at all so not sure I would complain too much.
Or the green line, or both. They may add a solid green wallpaper as a work around for it. But seriously I suspect yes the new calibration for the cold bug and probably some minor under the hood tweaks/fixes.