Squeaking noise

Hello,

I have been experiencing a grinding noise coming from the back of my vehicle for over a year now. It is not very loud, but I can't figure out what is causing the squeaking.
In fact, it appears when the car is twisted, for example when I turn on a parking ramp.

The noise is not coming from outside because I asked a friend to listen if it was coming from the suspensions, but he didn't hear anything. The noise is coming from inside but I don't know where.

I tried driving with the trunk open to see if it was coming from there and I also took the whole trunk lining apart, but the noise is still there.

I recorded the noise with my phone : (it's not as loud)

Zippyshare.com - Voix 001.m4a
Zippyshare.com - Voix 002.m4a

Has anyone experienced this noise ?

Thanks !

 

Ooops I think I'm in the wrong category. If an admin could move my topic to Prime care and maintenance.... Thank you !