KONI does rebuild their shocks. If you are the original purchaser and can provide your original proof of purchase/receipt, they will rebuild them for free (IIRC). If you're not the original purchaser, Koni will rebuild them at a cost of $100-$150 per shock. I don't recall the exact amount - I looked into it a couple years ago when I was looking at buying a used set on ebay. They supposedly come back looking like brand new.
Call or email Koni directly for current info.
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