It used to be offered as a kit, through dealers if determined it was needed for warranty work (or generously, often out of warranty), for about $250 I've heard. Eventually they fixed as many as they figured needed the work within a reasonable time (and/or too many people were taking advantage of it and stockpiling the parts), and they stopped selling the kits at a huge discount. Now you usually can't find them as a kit at all, though I recently searched and saw one European dealer advertising it for 1,900 Euro.
Here's the PDF giving the full list of parts and some procedures beyond what's in the service manual:
I started pricing out what it would take to buy all the parts today individually, and got this far (in USD):
part a: $206.90
part b: $32.60
part c: $12.62
part d: $183.99
part e: above $200… I quit part way through.