You might have a broken auger in the toner hopper. I have had this happen twice in the past year with those models. There is a small plastic linkage to the auger that moves toner from the hopper to the PCU. If a toner rock gets stuck in there, it will cause toner to back up and snap that linkage. The only way to fix it is to replace the whole toner hopper. Real pain to troubleshoot and replace.
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