photo tray error will not feed any paper

Check the pickup rollers for excessive wear, cracks, or dust. Remember that these printers are several years old, which means problems like this are becoming more common. Check for dust and see if that's the issue before assuming the rollers are worn out.

Now, if you find that the rollers are worn, there isn't much you can do outside of upcycling them as a scanner or replacing the whole printer. The design of the print mech makes repair of this problem impractical. You need to change the print mech on these printers as a single unit.

While there are no guides on the site for removing the jam door, it's not hard to do. Find the end with the tab that fits a finger and pull in to remove the door.