HW110 developed a leak. How to fix?

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From the tenor of your post I get the impression you should put it in the hands of a professional, as the HW1xx guns are not the simplest PCPs to service. I'm a somewhat experienced amateur airgunsmith, but had hell fixing a leaky HW100 I owned. Mine had a hairline crack across the face of the steel valve-seat that was only detectable through a loupe, and I had to order a replacement from Britain. Even if your's has a less problematic issue, those guns are more complex than more-pedestrian PCPs.
 
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Soap water and a drop in the fill port to see if the leaks there.. Then around the fill port to see if the leak is the oring.. Also sometimes if you blast it with a high pressure ( if your cylinder pressure is low ) it will dislodge whatever is keeping it from closing.. Sometimes a drop of silicone oil in the port and then filling will work.. Try all these before removing the fill port...
 
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I put a little bit of silicone oil in the fill probe, refilled it (for the 2nd time since the leak began) and shot 10 rounds. It is still leaking. I can tell it is coming from the fill probe port.

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