GTween accepts same values that accepts set method, in this example set method of Sprite accepts parameters: "redMultiplier", "greenMultiplier", "blueMultiplier", "alphaMultiplier".
Thus in GTWeen you need to use:
local testTween = GTween.new(heroBody, 4, { redMultiplier=255, greenMultiplier=0, blueMultiplier=0});
ahh, everytime you try hard to prepare a full explaining answer with examples, and there you go and get ninjajed again, by some guy in a Santa Claus hat with a straight and correct answer !
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Thus in GTWeen you need to use:
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