There was a guy in No. Miami Beach FL selling replacement diaphragms for ~$100 shipped that a # of guys on-here used. The replacement is a bit tricky, the slides are plastic and can shatter if you aren't careful. Still, it beats $100 apiece or whatever the factory price for new slides/diaphragms is. Do a search for the replacement threads and the website or search on ebay for the product.
There you go, Sean has the products. And you can pepper him w/questions, which he can answer authoritatively about your bike and any issues you may have.