I found these two links, I don’t like the look of either of them.
https://support.brother.com/g/b/faqend.aspx?c=us_ot&lang=en&prod=hl3170cdw_all&faqid=faq00100556_000
https://www.brother.co.uk/support/hl3170cdw/faqs/how-to-trouble-shooting/faq00100678_000