Uh oh, this is not good. I looked it over a bit more, there are minute amount of the damping fluid leaked outside capsule, I can see it because it's stuck between the transparent plastic and outer black shell.
[...]
I wonder if this will happen again and again, and more air gets in, more liquid leaks out.
Replace it. A small bubble is one thing, leaking oil another. And yes, once they leak they tend to keep leaking. Bummer. On the up side you get a new one.
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