There is toner/starter spilled onto a sensor near the drum, it mite just need to be cleaned, this sensor monitors the drums abililty to develope a image, if the cleaning does not work it mite be the sensor or the drum. The drum needs to be removed to clean the sensors.
Btw, I’m available to help over the phone in case u need at
https://www.6ya.com/expert/normanj_7893313f0751935f
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