My Macbook Pro is working fine, but keeps making 3 short beeps

My MBP has started making 3 short beeps every minute or so.
It appears to be working fine, however.
I rebooted it, and ran both the short and long diagnostics, neither of which found any problems.
What do I need to do?

OK, I've resolved this, and its a real dinger.
I logged out of my MBP and logged in again as another user, and there was no beeping, so I determined it wasn't hardware related.
I logged back in as myself and disabled all startup applications, but there was still beeping.
I looked at my system log again, and noticed that there was lots of lines like this:
May  2 15:29:10 Garreths-MacBook-Pro.local coreaudiod[1414]: Disabled automatic stack shots because audio IO is active
which was happening at exactly the same time as the beeps.
I started playing around with audio, and noticed that when I killed the coreaudiod daemon, Chrome crashed. This led me to think that maybe this was something to do with a Flash update, so I started poking around in Flash to find a disable option.
While looking, I noticed a Chrome extension call "Sleep for Gmail". I disabled this, and the beeping stopped. I looked in its setting, and it has an option to play a Notification Sound. Piece of sht software just plays a quad-beep and doesn't pop-up an alert, so you have no idea what the beep means! Arrrgghhh!
Anyway for other, the Apple hardware warning beeps are dull pronounced beeps with a distinctive space between each beep so you can count them.
What I heard was a sort of rapid pager type beep. If you here something similar, its probably software related and not hardware related.

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