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This Code relates to color gamma error in the Yellow development.
Possible causes Low toner density in the Y toner,Toner supply Y mechanism problem( not supplying enough toner),Laser exposure problem, image transfer problem.
My suggestion would be to ensure you have toner in the cartridge.
Check for UD yellow gears
If there is no developper in the UD yellow ,change the UD and the clutch of UD yellow.
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