I've a Kyocera F1118 MFP, that give me an error code C7990, "waste toner full" error. I've empty and clean waste toner container, but is still present. Someone have tell me that I've to change drum core, because is over 100.000 copy. But actual drum is still working well, and as eco-friend, I want to use it until real exaustion. What I could do? Any suggestion?

Thanks for help