This seems to be a fairly common occurrence so I've repaired this multiple times, once a year on average. The on site instructions are clear. Lift the top vent area off so you can remove the door. Open the door all of the way, lift off of the bottom peg and pull from the top. Lay door on a flat surface and with a small flat head screwdriver, gently pry the frame up (part 1804, door chock cover). There are small plastic tabs holding this part: use caution as they break easily. Once removed, on the door assembly, remove the small Philips screws: push the plastic tabs back, one side first; this part should then slide out. Both door handle screws are the exposed. Remove these (probably holding the broken handle parts, use the small screwdriver for lift to remove parts). Place the new handle on the door and replace the screws. replace the door assembly, be sure to lock all of the tabs back in place, snap door mask in place, replace door.
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