Rear Deck Music

#1
Hey, I'm new to this so bare with me.
I own a 2006 Corolla S which I've had for 4 years now. I like it, but there are some things that I'd like to change. Besides that, I've noticed recently that my rear deck is making wierd noises while I'm driving. Almost like a creaking sound. I figured maybe its the material that most of the interior trim is made of (hard plastic) shifting or whatever the case maybe. I would like to know has anyone experienced this problem? If so, what have you done to solve this? Thanks
 
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