You need to tell us the model number in order to get any help. Since you have a troubleshooting menu, then most likely you have an option called disable cartridge check. If you do select it and when the printer says ready, diagnostics mode, open the toner door and swap the cyan and the magenta toners. Now run the same test again. If the "pink" page still shows the fading, then toner cartridge and nothing else is the problem. If the cyan now fades, then that will tell us the optics for the laser/scanner have become dusted over and will need to be cleaned.
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