Ok, so the correct way to handle this all would be:
1) replace dispense motor
2) reset NVM 762-315 to 0
3) fill developer unit with new material
4) check with component control 093-009 if toner is entering developer
5) if all checks out, you should be good to go
I think you have tried everything, but I'm not sure if it was in this particular order. If you first replaced developer, then saw it was fading, and only then replaced the motor (possibly without resetting 762-315), then your developer was already depleted before you replaced the motor.
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