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They say they can replicate the noise by inserting a screwdriver and flexing the pillar. I'm not too sure even what they are looking at, C pillar doesn't mean a great deal to me. But they say BMW technical have told them that they have had instances where the spot welds have either not been welded or have broken. In answer to your question it hasn't been confirmed yet but that is what they are looking to as a likely cause
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