You can get the catalog pdf from the mfr webpage
http://shared.whirlpoolcorp.com/assets/pdfs/literature/Repair%20Part%20List%20-%208186458.pdf or look up the part number on appliancepartspros.com and it will show you the exploded view. Mfr webpage has all the revisions.
yours P/N look like
16 4452396 RH (For SS MDL) heavy spring 4451009 medium weight
17 4452395 Spring,Torsion LH lightweight spring.
Alternately you if you keep breaking the LH (lightweight spring) you can replace both springs with the 4451009 medium weight spring which is used on several models which don't offer the aluminum door (Meteorite) option which is why they have two RH springs in your production line. (to reduce parts on the production line)
UPDATE: I found out that if you put a drop of motor oil or other same weight oil on all the places where the spring goes through a metal hole or rubs on (when spring is new), that the spring will no longer break every year! Mine has lasted 5 years now without a change.GO TO START OF 2ND PAGE (POST #12 FOR PICTURES)1. unplug the unit
2. you need a Phillips screw drivers medium and large.
3. Open door and
hold onto the handle at all times firmly and remove two screws on the inside of the door near the top that are in recesses in the plastic door frame inner.
4. Pull door handle outward away from the hinge ends and it will come loose from the brackets at the bottom. Put door outer somewhere safe.
5. close remaining door attached to oven after you have removed the two screws you just took out.
6. remove 4 screws from the vent at the bottom of the microwave and remove the vent.
7. Remove the two screws under vent that hold the microwave to the oven frame. They go through the brackets marked #4 on the diagram.
8. Wiggle out the microwave just far enough to clear the screw on the bottom of the door that is blocked by the oven vent. (about 1 inch)
9. Remove two screws from bottom of microwave door that hold on the plastic door frame marked #2 on the diagram.
10. Open the door carefully.
11. You can now remove the Plastic door frame #2
12. Close the door again.
13. The torsion springs (whats left of them) are at the bottom and criss cross attaching to the left and right Door hinge.
14. I don't have any pictures but the springs are identical just one has the end with most bends at the left and the other has the most bends at the right. Hopefully only one broke so you can see how it goes through the hinges. Just put the other one on exactly opposite.
15. At the center where the springs intersect, put a baggy tie rap to hold the two springs together lightly or use aluminum speed tape. This stabilizes the springs and helps not to damage the door next time they break.
16. Good Luck :)
Pictures now at post #12