In the photo, the concrete below the upper window is NOT a lintel, but sill of concrete use for appearance. The surface light color is probably due to moisture with contaminents in it drying and leaving a surface deposit below. Perhaps the concrete sill did not have a proper drip ledges that stops the moisture from running under the lip and depositing materials.
The concrete over the lower windows may be a structural lintel or just an architectural effect.
I did not pick up a crack, unless it is near the middle of the upper concrete. That could be an old shrinkage from when the concrete was cast. That concrete is not structural.
Just a guess -