At a glance
What can fail
On manual transmission vehicles, if the parking brake isn't fully applied and the vehicle isn't in first gear as instructed, the self-adjustment pawl can skip teeth. This may allow the vehicle to roll on slopes, causing unintended movement and possible crashes.
What the fix does
Dealers will modify the parking brake control and install a plate or bracket to lock the self-adjust mechanism in place after adjustment.
Summarized — see the official notice for exact wording, dates, and contacts.