My fridge is an LEC but sounds as if it has the same type of door construction. The white pegs that the dairy door pivots on are inserted directly into holes in the fridge door liner.
Assuming you have this arrangement and have successfully obtained the necessary springs, you remove the door assembly as follows:
The principle is allowing the top and botttom door flaps to bend as much as possible during the operation, while holding them carefully and firmly to prevent them breaking.
Unless you are unusually strong, you need a flat-tipped screwdriver or similar flat lever about six inches long.
Extract one end of the door by
[1] inserting one hand behind the two doors from below so that you can bend them outwards together at the middle. I'm not taking about a huge bend, but as much as the material can take, which involves a movement of maybe 2-3mm. This effectively shortens the whole unit enough to allow you to force the peg out or back in.
[2]Simultaneously, use the lever to prize the peg out by placing the tip against the flange on the peg and levering against the edge of the fridge door liner.
The bend in the doors should be as great as possible as you reach the point where the peg is coming out. If you lever and bend firmly but not violently, the peg will pop out.
It's easy then to remove the broken springs or other parts, assemble the transparent top flap and the dairy door and fit the springs, then insert the pegs. You now have a complete door assembly in your hands.
To replace it in the door, insert one of the pegs and use the same combination of bending the middle of the closed door assembly while you slide the second peg into its hole. I found it best to do this standing up with the door braced against me.
Don't place too much force on the first peg-- the secret is to maximise the bending of the two doors for the necessary couple of seconds, and this can only be done if they're closed or nearly so.
Hope this helps.
Paul
June 2010