1) What do the LED indications mean?

http://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=hl2270dw_all&faqid=faq00000170_020


2) How to replace Drum

http://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=hl2270dw_all&faqid=faq00000154_046