At a glance
What can fail
Water can enter the ball joint where the wiper linkage connects to the motor linkage, displacing the grease and causing gradual wear that may lead to the linkage separating from the motor linkage, resulting in loss of windshield wiper function.
What the fix does
A water diversion shield will be installed at the ball joint, and the passenger-side wiper pivot and two wiper links will be replaced with new parts.
Summarized — see the official notice for exact wording, dates, and contacts.