I keep hitting a Z +/- over travel alarm. I have about 1.500 amount of travel. Has anybody had this issue and how did you get by it. There is nothing in the way as far as getting stuck on anything. Doe's anybody have any prints that show this area. I can't get behind the front panel to clean anything. (grease) This machine has to be one of the worst I have ever worked on for Maintenance Issues. Any help would be nice.