Could just be a loose wiring harness on the back of the speaker. Where it is a 2016 and under warranty, you could let the dealer do it to be sure. Not just that but pulling door panels off can be rather tricky. If they break it, let them buy it, know what I mean?
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2017 Ford Focus RS Nitrous Blue "KB43VER"
2014 370z Mag Blk 6M "KOKURYU" (Black Dragon)
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