Six years and no parts. That's a kick in the head. Contributing without having seen the 'sprung', could you support 2 corners on the level, and then put weight on the other two (diagonal) corners, to draw the door plumb ?
Years ago, I had the same experience. The door was made of two flat panels that were screwed together. There was 3/4" of space between the two panels, filled with insulation. I unscrewed the inside panel from the outside panel, and placed a 1/2" x 1/2" angle therein, and machine screwed it to the front panel of the door (heads showed from the front). Hope this does you some good.
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