At a glance
What can fail
On manual transmission vehicles, salt can corrode the bulkhead connector where the starter solenoid wire sits near the battery feed wire. This corrosion may allow the starter to engage on its own without turning the key, potentially causing the engine to crank and the vehicle to move unexpectedly if parked in gear.
What the fix does
The starter solenoid wire will be moved to a different position within the bulkhead connector to separate it from the battery feed wire.
Summarized — see the official notice for exact wording, dates, and contacts.