I only have two more suggestions before recommending that you schedule a service call with Xerox. Suggestion one - follow this link and type the same message in the search field that you typed in your last response about error codes. So, type in "Unload top output tray" without the quotes. The link is to the Phaser 7760 Knowledge Base and there are two results that show up when searching the message that you are seeing. Click the first result from the search and then you'll see the two things to try. Both results are simple to do and won't cost you anything but a couple of minutes. My only other suggestion would be to call Xerox and ask if a Technician can come out and downgrade your machine firmware to what it was before all of this started.