So I sent the Robots to look for what you were talking about. The closest it found was just a post that showed the main and backup chips.

There were several other posts that had Riata in the title, but none of them had the story you remember.

A more general web search found the backup chips of course, but couldn't find any stories around why/when/if they were put into use.

Let me know if you have any more details maybe around who posted it.

- Bob M