Christy,
I got parts for mine from Sew-Classic and my LSMG. The motor noise was a bearing howl. Not a scream really but not a growl either. The oil on top did fix it.
I started by making a list of what I needed, then tore it apart and started cleaning it. As the parts came in I cleaned them too and reassembled it. Then some adjusting and it's a keeper.
Joe