I took my Ohlins to the local Ducati dealer, and he charged me for 1hr labor (included cleaning inside and out) plus parts. Right about $200 total with Ohlins parts and oil. He had it done within 2 hours of me dropping them off. Sure, I could have saved some cash, but it would've taken me several hours, and only having off 1 day per week, it was worth it. I had him replace the wheel bearings as well, which was an extra $20 labor, and I supplied the parts-Nachi bearings (made in Japan) from a local supplier at about $10 each. I dropped them off before work, picked them up at lunch, and got to test ride the new Ducati Scrambler.
Mine were leaking when I bought the bike, and the Motion Pro seal mate actually stopped the leak. I figured 11 year old fork oil should be renewed, regardless. I have now idea how much oil leaked out when I picked it up.
http://www.motionpro.com/motorcycle/partno/08-0395/Ken