Drivers door, cheep sound!

Hi,



My ZS has been making a horrible cheep sound from the drivers door area. It tends to happen as I go over minor bumps. I don't think it happens when the window is down - just when closed. It is almost like a bird cheering/tweeting, and sounds to me like something is loose or needs lubricating.



I removed the door card, but cannot see anything obvious. Any suggestions? Driving around without the door card is awful!

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