The colored toners are leaking slightly inside the printer. I tried cleaning what I could but the brush at the back (behind toners) seems covered with colored toner ink as well.
You can try removing all of the toner cartridges and once the toners are out, you can check the paper path to see if you can locate any additional toner that has leaked inside of the printer. You can use the information in the link HERE to check the paper feed path. After checking the path for any toner that has leaked, you can perform 2-3 cleanings of the ITB and the fixing assembly.
