I have visions of old Japanese ladies building these things for some reason.

It was probably very easy to make mistakes. Some of the wiring junctions are very crowded.

It is like debugging a very difficult software problem in a way. In that sense I can relate to it. It's very easy to come up with false conclusions using a debugger in a large, complex program, for instance.

Whatever. Ordered some heat shrink to plumb it back in.