i just bought a brother sq9000 and i had a similar incident with it and it jumped timing ?? i bought it online and theres no dealer close so i just took it to my usual sewing machine repair man hes a genius he had it fixed and cleaned and oiled in about an hour and now it purrs like a kitten again. it was soo worth it to get it fixed properly the 1st time with no hassle that i really didnt mind having to pay for it. i feel like hes really reasonable on price anyway and he can fix anything no matter what i do to it lol.
carla