Tuning Small holes in Vulcan air tube?? ??

I am re sealing a Vulcan 1.0.

It has a small leak . Once apart, I assembled the air tube, fill port and valve assembly hoping to isolate leak. I heard a small hiss and noticed 2 small holes.

Pic attached. I did a search and did not come up with anything. Any thoughts?

Thanks in advanced for all help.

Bob
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