I know you know this already, but If that was my house, and I lived there with my family., I would change the entire panel. Those panels catch fire, the breakers are no good and can loosen and short out, Arch and overheat.
Spend the 1200 and keep safe, the truth is, not many electricians will even work on your panel, well not over here anyway.
Kinda like a car with no brakes.
Made in the