Here's what happens when there is paper loaded in both Tray 2 & Tray 3 and the printer is configured to pick from Tray 3:
- hitting "print", the printer displays "Load Tray 3 (plain/letter) or press [OK] to use available media.
- I hit OK, and it prints from Tray 2 instead.
If there is paper only in Tray 3, but none in Tray 2, then the printer simply displays "Load Paper"
Bottom line = I still can't get it to print from paper loaded in Tray 3.