My Elna did that years ago - pure neglect - made too many projects w/o stopping to oil the machine. A little embarrassing to pick up from the repair shop. Let's hope that's all you need.
At the time, I was in the middle of a wedding dress and borrowed a friend's Singer - it wouldn't sew the satin or lace, so I broke into a vacationing friend's house and took her Elna. I did leave her a note. Now I have multiple back up machines.