092-651 (ADC Sensor Error)
It is the ADC sensor stating the error, but the cause is typically a leaking toner, so take out, or inspect the Transfer belt for spilled toner, then work back to the toner of the found color, replace the toner, clean the belt, power it back up.
Not officially, you could search Google for something like "Xerox 6015 Service manual" ;-)
Did you find out how to fix the problem ? Thanks for any answer that could help me out.
I have read the service manual, but I could not find how to clean the transfer belt, only where it is located. Not even how to replace it. I'm lost for words here.