This is an AL Mikron first and second that I have had about 6 years, since I started diving. I don't really notice this while diving but it has gotten more and more noticeable on videos I shoot. Present before and after servicing. Does not seem to affect performance. Heard at roughly 18, 14, 8 and 2 seconds in video, on exhalation. So just what is it? Can I fix it?
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