Amana NED7200TW Electric Dryer "nothing film" Questions

...film of black grease. It was also on the grill that's on the back of the drum. Is this indicative of something failing? Is it something I can fix myself or is it a job for a professional? My ...

...nothing is blocking the outside vent,if there's a cage or anything outside that's blocking the air from blowing out remove it and don't put it back,go back inside and blow out the vent line,put the ...