I did some extensive research for you and found:
This Link to ISM FASTENING SYSTEMS
http://www.ismsys.com/ToolInfoRequest.aspx
If you Look Under the Category:
Coil
Nailer Roll 15234 Open That PDF and It shows an Exploded View of Your Gun, and Available Parts. I think you should be able to find a Air Tool Shop in your Area That Specializes in Carpentry Air Tools and Probably Save a Bunch of $$$ on a Rebuild...However, Here is The Address & Ph. Number for ISM, and You could Call and get an Estimate of email them too.
WESTERN OFFICE
AIR NAIL
SOUTH GATE, CA
800.479.6455
Sounds to me Like all you need is a O-Ring Kit, and Perhaps a New Driver.
Good Luck, I hope all this Info works for You.
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