Had a couple folks with your exact same problem reporting mixed results when they "reset the calibration values for the DC controller". Maybe it will work for you...
Here's a description from the Service manual on how to do this:
Resetting the calibration values for the DC controller
Performing an NVRAM initialization clears the calibration values from the formatter, but it does not clear the calibration values from the DC controller. If problems with color-plane registration persist after performing an NVRAM initialization, you should reset the calibration values for the DC controller.
To reset the calibration values for the DC controller
1 Open the top cover.
2 Press and hold the engine test switch on the left side of the printer for several seconds. (You need a pointed object to reach inside the small hole and press the switch.)
3 Close the top cover, and observe the control-panel display. If the message Performing Calibration appears, the reset was successful.
After you reset the DC controller:
-- Perform another Full calibration (may have to try full calibrations up to 3 times).
-- Follow up with another Cold Reset.
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