ricoh spc840dn toner/imaging issue

Hello All,
Have a problem with our ricoh spc840dn just replaced the imaging units on C M Y color units and my yellow is now washed out/hardly printing. I did have a SC324-05 error initially but was able to clear after turning gears on side to agitate developer.
Any help / suggestions on how to get this back to working would be greatly appreciated.

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