I found out that the cables for the extruder steppers on my Powerspec Ultra 3D printer are bad. I found some cables belonging to different kind of stepper motors so I cut the cables off the stepper motors and spliced the cables into the cables coming out the bottom of the printer. While trying to load filament into one of the extruders, I broke the hothead tube while trying to remove the nozzle. I had to order new cables and extruder assembly from Flashforge company.