At a glance
What can fail
The rear deck spoiler may lack a vinyl gasket under its pedestal, allowing it to rock on the deck lid. This rocking causes metal fatigue and cracking, potentially letting the spoiler detach and become a road hazard.
What the fix does
Install pedestal mount gaskets, retorque mounting screws, and repair any cracked trunk lid sheet metal as needed.
Summarized — see the official notice for exact wording, dates, and contacts.