Tuning FX Wildcat MK3 maintenance question...

Our squirrel season is over on Saturday. So I am already thinking about next year. I am not having any issues with the gun or anything but I suspect that my Yong Heng Pump has been allowing moisture into my gun. (I have not changed the filters on the pump like I should and I noticed the fill probe has corrosion on the end that attaches to the hose). I was thinking about replacing the seals and have it checked for moisture problems. I am going to get a different pump and possibly hand pump during the hunting season just to top the gun back off. The gun shoots great and I have it tuned exactly like it. This is exclusively a hunting gun and I don't shoot it that much outside the season. I just want to make sure its okay and there are not any issues before next hunting season. Is there someone you guys could recommend that I could send my gun to that would change the seals and check it for any moisture damage? Thanks for the help!


 
I have several different fill probes. Some from Hatsan, some from FX and a couple other makes. All of them have staining on them. Even the new ones that have never been used. I was worried I had moisture too. But I think it is just tarnish. After our small game season ends, I plan on doing a full tear down and cleaning on a few different guns just to be safe. I am concerned about moisture in the receiver too. Taking the guns in and out of zero degrees weather, snow, rain and them back inside.