LTC8K6
Lifer
Seems like they just kept installing the bad switches, even for ordinary service on non-recalled cars, as well as on the recalled cars.
https://autos.yahoo.com/news/gm-recall-puts-bad-ignition-switches-back-cars-181500602.html
On Aug. 7, 2014, GM issued a new recall on various serviced vehicles which "may have had a defective ignition switch installed during a service visit.
https://autos.yahoo.com/news/gm-recall-puts-bad-ignition-switches-back-cars-181500602.html