Don't panic yet.
I have a list of trouble codes for the C364e on my phone as well and the code is there. Developing unit motor failing to turn. Obviously one of the new imaging units had a problem with its developing unit that was causing the drive to lock up. Not the first time I had seen this so still no need to panic.
I started from the left and pulled the yellow IU and used my pliers to give the developing drive coupling a turn clockwise on the back of the IU. It was jammed.
Sometimes the developing powder in the unit can settle in transport and jam the augers inside the unit. Giving the unit a few taps on the side while turning the coupling quickly freed it up and I stuck the unit back in. I pulled the other two out but they felt ok and went straight back into the machine. I then went through the gradation adjustments without any more problems.
I will point out though that if you have this problem you need to be careful not to shake up or spill any developer out of the new unit as you will not be able to use it and it will need to be replaced. Also be careful not to turn the coupling to hard or it can break. But don't worry if you do as you have a spare on the old imaging unit that you just took out. And always turn the dev unit drive in the correct direction.
Also someone had played around with the date on this copier so now it shows the image unit life counter start dates as being in 2012. Not a problem but may confuse the next tech who comes to look at it and will wonder why the image units were changed 3 years before the machine was even manufactured.
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