1.  Labels & Signs or 11 x 17 not printing and is prompting for Paper in Bypass tray and showing ??? for Tray 1 or 2

Solution: Tray was not recognized when new stock was replaced. Open Tray, move Paper Guards away and bring them back to adjust. Make sure ???  is gone on the printer.  If the error continues to show on the screen, contact the Vendor for further support.