This was to make sure that the issue with the gamut in the last few shots was NOT caused but a colorspace mismatch during the scan.
I captured the print scan in aRGB and converted to sRGB.
Here is the green channel histogram when in aRGB and also the same channel when converted to sRGB. The two histograms were overlaid and ‘difference’ applied.
As expected the larger shift manifests itself in the darker areas where sRGB is approaching out-of-gamut.
Again this is determined by the rendering intent but clearly that huge spike is not caused by the conversion.