your regulator has a lifetime warranty for parts if you service it every year at a US Divers/Aqualung affiliiated store. It could cost you more in parts than it will to service it at a dealer since you will not get free parts.
Why would you want to fix your own reg when you don't know how to, don't have the correct tools, and will void your warranty by doing it yourself?
I have always had to pay for parts and labor when having my regs serviced, this time is no different. I was told right up front that since I did not buy from them I would be paying for parts. I have already payed plenty for parts kits. It does not apper to me that there is any warranty on the regulator but I could not tell you this for sure.