I'm somewhat used to that, due to working in legacy / embedded / unpopular software areas :) Maybe I should do a writeup of some of the more significant investigations. Such as the six months spent (intermittently) on a bug reported only as "touchscreen sometimes stops responding".

In fact, returning to the car theme, I was recently able to save myself a considerable amount of money by using Youtube videos to disassemble my dashboard, re-solder the joints on the back of the instrument cluster, and re-fit it. The only difficulty was matching the video to the exact model of car. I didn't expect to find it, but there was a video with a few dozen views of exactly what I needed. Previously I'd have had to resort to Haynes manuals, which are excellent but not quite as good as being able to watch someone else do it.