210 Wagon squeak in rear: How to diagnosis?
 

I have a 2003 210 wagon and there is a loud squeak when I go over any bumps like a speed bump for instance. Happens even if I go over it slowly. The car ride and drives fine with no issues.

I think it's coming from the rear suspension but I'm not sure where or how to start with diagnosis since there are a lot of links back there.

Is there a link that wears out first that I should check?