At a glance
What can fail
In cold, humid weather during long drives, throttle icing may occur on gasoline fuel-injected vehicles when the air pre-heater vacuum switch becomes contaminated. This prevents the throttle from returning to idle when you release the accelerator pedal.
What the fix does
A de-icing kit will be installed to prevent throttle icing.
Summarized — see the official notice for exact wording, dates, and contacts.