Unplug your GE Profile refrigerator and open the door.
Pop the door tubing off its retaining strips on the door. Use the tip of a putty knife to pop the tubing off if need be.
Pop all areas of the tubing off the door and remove it.
Fit a new piece of tubing over the interior door frame.
Pop the corners of the tubing into place with your fingers.
Run your fingers along the frame of the door, snapping the tubing into the retainer strips as you go. You will be finished when there are no gaps between the tubing and the door.