Creaking Rear Suspension

[CER]

Firstly thanks to this forum i managed to fix the wet carpet issue, http://www.weirdlittlebiscuit.com/passat/leak/index.htm I found this link in many postings, and therefore didn't have to post again on the issue.

Now to my next issue, and unfortunately this seems to be a little less clear cut as to what the problem could be, and therefore there does not seem to be a definitive 'how to' guide on how to resolve/identify the issue....hence the post!

The symptoms are when i bounce the rear suspension of the car, i get quite a lound creaking noise, and i notice it most when getting in and out of the car.

So essentially what I'm looking for is a 'how to' guide to diagnosing creaking suspension issue. Is anyone able to point me in the right direction?

Thanks...