1. Contaminated or damaged Imaging unit contacts. - Remove and clean the contacts and inspect for damage.
TROUBLESHOOTING TIPS AND HINTS:
Imaging Unit Failure message occurs because the printer cannot detect imaging unit motion, up-and-down. The Transfer Belt drives this motion, and the Drum Contact Assembly detects it.
1. Swap the Imaging Unit Cotact blocks between two imaging unit positions. If the problem follows the Contact block, it should be replaced.
2. Open the Top Cover and defete the top cover interlock switch. The color imaging units should raise in succession, cyan, magenta, then yellow, and then all lower at once. If one or more imaging units do not raise smoothly or drop prematurely then replace the Transfer Belt assembly.
Try this.
Resetting the NVRAM will reset all printer values including network, printer setup, job defaults, and color calibrations. Press the Down arrow key and scroll to Support.
Press the OK key.
Press the Down arrow key and scroll to Service Tools Menu.
Press the OK key.
Reset NVRAM will be displayed.
Press the OK key.
Reset NVRAM and Reset Printer NOW will be displayed.
Press the OK key to reset all the settings to default.
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Fixed! 
Did not fix.
Replaced the Print Engine Control Board,
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