Thanks for posting. Long video, but at about the 12-minute mark he says something about warranty work, relevant to TFA. He says that the hourly rate for any work done under warranty is set artificially low by the manufacturer.

Say a dealership would normally charge a customer $200 an hour for a job, of which the technician will make about $50 an hour. But if the same work is done under warranty, i.e., the manufacturer is paying, the dealership will get only $100 an hour. The dealership, in turn, will reduce the technician's pay to less than $50. Thus, the manufacturer is squeezing the dealership, which is squeezing the tech.