When I got my 401, I cleaned and oiled according to my manual. Love it. Have done lot of stitching. My presser foot was a little tough to maneuver but fine after cleaning. Had some thread bits in some areas. There are also a lot of videos on YouTube that are very informative. I watched those over and over again. And followed along with the videos and manual for cleaning. She purrs like a happy cat! My manual has a trouble shooting section also. But just about any trouble shooting manual is the same. just need to check the different areas. Mine is in a desk cabinet.