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I have a MF731Cdw. There are black spots along the left side of the paper. I have cleaned fixing assembly and ITB. I have half toner cartridge left and do not want to waste that.  Have done nothing new or different. 
When trying to print, it shows two paper trays. But there is only one to fill. It shows that the second is where the toner cartridges are. When trying to print it thinks there is no paper but the tray 1 is filled. I have no idea what the top tray is....
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