At a glance
What can fail
A manufacturing residue may block the crankcase vent hole in the air cleaner case, allowing pressure to build in the engine and dislodge the cylinder head cover gasket, causing oil to leak onto the rear tire.
What the fix does
Dealers will inspect the air cleaner case and remove any obstruction blocking the crankcase vent hole.
Summarized — see the official notice for exact wording, dates, and contacts.