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hm..
A CCD scanner shades brightness if the print aren't pressed strongly on the flatbed, that why I debind any prints even just stapled 2 papers.
there is no function to change color balance between the left & the right on the scanner.
if the problem is always occurred in the same range even on a perfect flatted scan, then make an action of photoshop (add adjustment layer with a gradation mask), or ask Epson of the trouble.