So...the whole tray fell out ! It was a problem just waiting for you to push the button...
If you'll look closely at the tray's rear end there are 2 holes...those match up with 2 lugs/studs in the printer. bend the holes a little and you can get the holes back onto the lugs/studs....then bend back out so it stays...Then the tray just pivots back up like it's supposed to....
Good luck...