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I am in N. CA, which quake zone, but nothing apparent. Is there something like a thermal imaging device to see cracks in the foundations or pockets in the slab?

It is a rental, don't see it day to day. The renter mentioned it two years ago, got worst in the past year. In Northern CA. The house is two story. Had a General contractor look at it. He asked...

The house is on cement slab, about ten years old.

I disassembled the hardware, found no leaks and pipes apparent good.