Does your NEX-5n make a quite high pitched noise a few seconds after switch-off?

I have a 2 week old 5N bought new. I must have turned the camera off 30 or 40 times and it does not make any noise at all and no vibration at all when turned off.

When I read this post I turned it on and off a few times in case I was missing something. No Noise, not even faint.

I have critical hearing as I work in audio engineering.

Can others give their opinion on this.

What is the line from Sony. Is it supposed to "Clean" in the way mentioned in this post every time the camera is turned off?