I have a 3-year old Brother HL2140 - which is printing OK until the last few weeks. The paper is always jammed halfway right after one print, or even the first print. I had to yank the paper out manually with the toner smearing over it. I checked the troubleshooting manual, but I still get all the jammings. Is the drum unit broken? Obviously, dismantling the thing and tinker around will be a risky job, and I rather send it to a qualified technician.