The Six Stages of Field Service Support
web.archive.org
web.archive.org
Since I am going on my third visit to get my non-electronic washing machine fixed, this one came to mind.
It's getting harder to find on the internet, so part of the reason is to get it in the hands of the HN crowd. If you're new to this: Enjoy!
The article should have been top 10, but not in this weak field.
/a greybeard