Yellow toner usage is high , ventilator at back panel is yellow. Cannot print pure red colors
I would guess the yellow toner cartridge is leaking. Clean out the printer, including the fan and air path to the back panel vent, and inspect the mechanics of the yellow cartridge section. If no abnormalities are seen there, try a different yellow cartridge. Stray or excess yellow toner might mess up all of your colors - do you see green blotches in blue areas?
If you had normal toner usage, I'd suspect a problem with the corona wire for yellow that lets the toner blow away from the paper instead of adhering. That would leave your reds with a magenta hue and paint the fan yellow.
You could even have both problems if toner powder has contaminated the high voltage contacts.
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