At a glance
What can fail
The left-rear axle shaft may not be installed correctly, causing the splines to wear. This can result in power loss to the wheels and potential vehicle rollaway if parked without the brake applied.
What the fix does
A dealership will inspect and replace the left-rear axle shaft if needed, and inspect and replace primary drive unit components as necessary.
Summarized — see the official notice for exact wording, dates, and contacts.