It had developed a very slow leak, so I had Tim go through the entire gun and replace the all seals, clean and lube as needed. The bolt was feeling like it was starting to gall on something so I asked him to check that out as well. It is smooth as silk now. I think the gun just needed a thorough going through, cleaned and lubed. I bought it used a few years ago and the guy I got it from said he had shot it quite a bit in his back yard. I have shot the holy heck out of it since I've owned the gun. Tim said the "O" rings were in need of replacement. He uses the best available, so I'm guessing this tune up will last longer than me.
Keep an eye out on Airguns of Arizona's used gun section. They seem to get more of them than anyone else. Sunday night I checked and they had two listed. By the time I called around 10am Monday morning, they were both sold.