This may be a hardware issue. I know you have spoken with a technician on this one already, but you may want to reach out to service again and request a different service tech to take a look at the issue. Please call Xerox Support Department at 1-800-821-2797 or 1-800-835-6100.
A couple of tips you can try are
If you are still having issues after trying these steps, I suggest that you call into our support department for assistance at 1-800-821-2797 or 1-800-835-6100
Our printer has been down for a year then we got it back up and have now been getting the Error 042-325
Tech not sure I've seen the yellow drum
but we've replaced that drum several times and still getting the same error
would it be the main motor drive
oh and another thing the tech found that the motor for the waste toner was jammed, possibly because of the non use of the machine?