In this case, there isn't a wild goose, it is sitting neatly penned up. They literally have a device to get error logs from the car with manufacturer specific c

In this case, there isn't a wild goose, it is sitting neatly penned up. They literally have a device to get error logs from the car with manufacturer specific codes specifying what is wrong. That process is the same first step they would have taken anyway; I mentioned what I did to make sure they would have the right part available. As it turned out, I still had to wait an hour and a half once they figured it out because, lo and behold, they didn't have one and had to go out to get another.