Actually I forgot to address Tan Man's sarcastic line, "This is professional problem solving!"

Actually, yes it is. It's just that your perception of the problem and my perception of the problem are different. Problems are usually things that continue to occur. You are immediately going to react, and think that the original post was a specific problem to be solved. It was, but it more than that.

Open your mind just a little. Realize that some other person in the future may search the forum for "Wiring Harness" and find this thread. Don't you see that some advice that goes beyond the specific problem might be helpful?

Solving the problem is not just correcting the specific occurence. It is figuring out how to prevent it, and similar ones in the future.

So here we have the specific occurence, wrong part. It has already happened. Question is how do we prevent it from happening again.
I offered up one way. Others, including you, offered up some other suggestions.

By the way, it's not unusual for people to not understand problem solving.
Most managers I deal with are absolutely terrible at it.

Steve