At a glance
What can fail
The shifter release button may be misadjusted. If you try to shift out of Park with low force while the key is locked, a connecting pin inside the shifter can break. When this happens, the system that prevents shifting out of Park without the key won't work.
What the fix does
The dealer will inspect the shifter interlock mechanism. If it doesn't work properly, they'll replace the shift mechanism and cable with a self-adjusting design.
Summarized — see the official notice for exact wording, dates, and contacts.