I have received word from K2. They would like to send me a new ballscrew assembly for the Y axis. I think the original is bent. If that doesn't fix it then whey have agreed to take the machine back for a rebuild. It's going to be 3 weeks before I get the new ballscrew assembly. I didn't want to have to do the work myself, but it should be faster and cheaper than sending the machine back. It's progress anyway.