At a glance
What can fail
Water from the front wheel can splash onto the electrical plug connection of the 12V battery ground cable at the DC/DC converter, causing the electrical contacts to corrode.
What the fix does
Dealers will replace the ground cable section with a repair cable kit and inspect the 12V plug connector for corrosion, replacing additional wiring harness sections if needed.
Summarized — see the official notice for exact wording, dates, and contacts.