Dear BMW experts, I'm getting an unusual, almost creaky noise from around the driver's door on my 2003 530. It's as though the door is not tightly anchored to the frame of the car. The noise occurs when the frame flexes such as when I go over a bump or when I come to a complete stop. It's more pronounced when somebody is sitting in the back seat behind the driver. I've held my hand against the front door panel and the window and the noise still happens. Raising and lowering the windows doesn't seem to help either. It's not very loud, but it's annoying.
Any suggestions?
Thanks,
Ambrose