We own a D125. Not on lease. Purchased used from the Xerox reseller (now I think just part of Xerox actually). We also have a service maintenance agreement with them. Pretty much everything we print is identical. 11x17, 20# bond, duplexed. We pull from one of the two trays on our oversized high capacity feeder. For the first couple years the alignment issue went unnoticed or didn't exist. Once we mothballed our offset press and started needing to do more auto-tray switching between the two oversized trays (more sheets per job since no more offset) the alignment issues became very noticeable. First we simply focused on trying to get the two trays to match one another, then it became clear that a single sheet printed out of any tray on the machine could not be set to align properly. The primary issue is skew and the D125 has no adjustment for skew whatsoever... just perpendicularity, magnification, and movements on the x and y axes. We've had their "best tech" work on this many times, their production analyst, our normal tech, their "even better tech". For months we just gave up on auto tray switching and pulled purely out of one tray. The issue actually isn't even bounce. The alignment is pretty consistent from sheet to sheet. The issue is that if you try to print a vertical line down an 11x17 sheet of paper, on one side it is centered and parallel with the paper path, on the other side it is diagonal. They have replaced a LOT already. Again, 14 months now. It has been escalated to Xerox engineering now but meanwhile the service manager is using every excuse imaginable for why we shouldn't expect it to be able to print a single sheet of paper properly. Custom expectations document states that from to back registration should by +/- 1mm. It doesn't specify where that should be measured, what size paper or what paper weight. Any tips?