I recently went through this with the same model, my Bernina tech. found evidence of previous fire, wanted nothing to do with the machine, he also with permission confiscated the wires to prevent any future fires. I ended up giving it to Macybaby.
My machine the body was in great shape, needed a new wire brush, new cam and wires and motor-hundreds of $ of repairs.
Good luck with your find, I really liked mine and was sad to see her go but. she is where she needs to be.