However, a Reddit post I found today showed another One X in a similar state with comments that it's due to the cleaner that was used on the board. www.reddit.com/r/consolerep...
From the consolerepair community on Reddit: Today I was cleaning my Xbox one x’s fan and I’ve seen these spots on my mother board although my console has no issues or problems it runs every game smoot...Explore this post and more from the consolerepair communitywww.reddit.com