Here's a good one! Xerox 123- Tray 1 works perfect. Tray 2,3,4 and bypass will only make one copy at a time. If multiply copies are attempted on tray 2,3,4 or bypass it will Z fold but not jam, instead comes up with a paper mismatch message. We have replaced all rollers, secondary clutch and paper sensors. If we take tray 1 out and put it in place of tray 2 the problem still exists....