Correctly identified as the RIGHT side however I have a feeling it's more likely related to the firewall break on the driver side for the brake pedal and steering.
I would look under the hood and remove the parts around the cabin air filter. I would bet a seal has worn out and allowing water in where it shouldn't.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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