The above video, titled “Internal - Apple Authorized Service Provider 101,” appears to be from 2007 (some things might have changed since then).
Sonny Dickson has posted these Internal Apple videos about the repair and QA checking of iPhones and iPads this morning.
It will be interesting to see if Apple takes down these videos.
In the meantime, have a look. You also might want to download these locally if you like them. A bunch of other videos are on his YouTube channel and below: