At a glance
What can fail
Salt and moisture can enter a hole in the upper strut housing, collect at the seam, and corrode the strut tower structure. Over time, the corroded housing may crack and separate, potentially contacting and breaking the steering column shaft.
What the fix does
Dealers will inspect the strut housing and apply sealant, resin patches, or a reinforcement plate depending on the extent of corrosion found.
Summarized — see the official notice for exact wording, dates, and contacts.