I took the housing off my Bernina 1260, cleaned and oiled it. It's out of warranty so it doesn't matter if I do the cleaning. I use to work with an ex industrial sewing machine technician. I would bring him used machines and he would show me how to take them apart and put back together. The computer machines I have taken the housing off have the computer part sealed, don't mess with that part. I even learned how to set the timing. It's not rocket science. Old vintage Singers are the best machines to have to rely on. If you have an old broken machine or see one at the thrift store for few dollars, buy it and take it apart.