There's a long discussion here:
https://986forum.com/forums/performance-technical-chat/42802-interior-vent-debris-2.html
My contribution starting at post #37 shows a way to remove the stereo/center console and cut the duct get access for the repair.
More recently there have been a couple threads mentioning plastic plugs that can be inserted in the holes.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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