If I were you, I'd try applying some kinda lubricant to various areas, one at a time until you pin point the issue.
i.e. put some silicon spray on the door seals, if still squeaky, apply to hinges etc.
I had a groan in mine which I thought was suspension related. Turned out to be the bonnet creaking on the rubber stopper dealies on either side at the front.
I tightened the bonnet hinges and put some sticky backed rubber cushion thingos on the stoppers and shhhhhhhhhhh.
Noise gone.
Does it stop it's when raining? (only in the dry?) or all the time?