You got me pointed in the right direction. It appears the gear on the left side of the tray had broken loose and is impeding the tray from coming out. The gear was catching the bottom of disk indention and would not move past that point. I subsequently press down on the gear while moving the tray forward and pulling up on the tray. It has just about come out. You can also see that the white push tab pushed all the way in; it was loose because it has popped off the sliding tray.
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