13,008.47: The drum heater is too hot.
This would cause the printer to reboot trying to protect itself (and Xerox) from a possible fire.
The most common fix is to replace the drum asm.
Pt # 105115080 about $240.00
I recomend having a tech who is trained on this model change it as changing it is not a very simple task.
4,018.48: This fault code indicates a problem with the process control system. The printhead temperature dropped below the head cleaning needed threshold.
11,009.46: Communication timeout failure detected.