Hi, this is my first post on these boards. I have a Pfaff 1471 bought around 30 years ago. I love that machine! It suddenly quit working and I believe it is the mother board finally giving up. There is a shop in Penn,
https://brubakerssewing.com/. The owners specialize in repairing old Pfaffs. You might want to give them a try. I have no connections to this shop, just passing the word.