It is not necessary to remove the paddle driver as claimed by Solo. Firstly, remove the 5 screws underneath the unit which hold the base on. The 2 special screws (a slot with a bump in the middle) can be removed using pointed pliers. Then, inside the heater chamber, remove the top screw which holds the element to the white insulator. Then remove the 8 screws around the bottom of the heater chamber. Prise the base from the main body which can now be lifted up. To detach completely, you will need to disconnect the display panel cable from the circuit board. To do this, you need to first peel off the rubbery stuff which holds the connector together. I marked both halves of the connector to ensure putting it back together the right way.
I found this video useful:
http://youtu.be/44PHthqoOQY
RobertInFrance, February 2014