At a glance
What can fail
The clockspring jumper wire may rub against the driver-side airbag horn plate, wearing through the wire's insulation and causing an electrical short circuit. This can trigger the airbag warning lamp.
What the fix does
A Ford or Lincoln/Mercury dealer will install a new clockspring jumper wire with a protective mesh cover to prevent contact and chafing. Repair is free.
Summarized — see the official notice for exact wording, dates, and contacts.