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That error more or less means that a part is non-detected.
If there is spilled toner in abundance in the area, removing components, setting the sensitive ones (drum, perhaps the developer too) aside in a lightless dust-free place to protect them against direct light damage, and cleaning the area including the electrical contacts (with the power off) with a clean dry rag cloth, might aid in the problem - if the non-detection is owing to spilled toner on electrical contacts.