Hi Gary, I've never encountered that error code but the service manual says:
"This is a debug error that occurs at product development. In principle, it does not occur for mass-produced products; however, it might occur due to unexpected causes such as external noises.
1. Restart the printer. If the error does not occur, observe the printer for recurrence.
2. Re-install the firmware.
3. Replace the Main Board Assy."
Also I would try unplugging the printer for a minute and see if the error comes back.