Ron,
Not looking for cracks, looking to see what that large stain looked like in the infrared camera.
Being as that is not available ...
Billy said: "Evidence of a Previous Water Event."
I asked: "What was behind you when you took those photos?"
And followed with: "The left stain 'looks like' water entered under the vinyl, possibly from a door behind you, and then dried out."
No answer from you on that question or my comment.