I just came across this post, you've likely solved it by now; However it is a "Toner density" error related to your cyan photoconductor. It is a defective connector. Replacing the cyan photoconductor should solve problem.
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sc 491 is error signal is detected for 0.2 seconds when charging the drum or development.
• High voltage leak
• Broken harness
• Defective drum unit or development unit
• Defective high voltage supply unit
You just have a problem with colour PCU (SC 365 - magenta, SC366 - cyan). The main reason is that toner density is abnormal. Sometimes, when you replace toners, printer receive to much toner for a short time, and after that you have an abnormal toner density (higher). You can check in service mode (hold up and down arrows for 6-7 sec, release them and press ok button) following thing : choose 2. engine then with arrows choose 3. process then choose Vt display, for each color by default there should by somewhere arround 2.4V. If you see for some colors, for example 0.02V, then this is a problem(to much toner). In this case the only thing that you can do is to restart printer and try to print enough pages, filled with problem color. Usually you can print max 3 pages. Then restart printer and try another 3 pages. Print until the you will be able to print at least 4 pages continuously. Good luck and remember that this is a technical problem and you should ask someone qualified for the job. I am sure that 80% of service engineers can't repair this issue. But I can.
sc 366 is hard disk drive bad sector will need to call in a engineer to fix this problem might need a new hard disk if he cant format it make sure you always shut the machine down correctly switching it off in correctly causes this fault to occur
Try loading letter size paper in tray1 .. Open the front door and the assembly attached to the front door is the transfer roller ASM. mybe you knocked it out of position ..There are green plastic clips that allow someone to the transfer roller unit so its easy to mess up good luck
It may be something to do with the paper size settings on printer driver, document print settings or page setup. If for example the computer thinks the paper size is Letter, and the paper in Tray 1/2/3 is A4, it won't print.