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Spray the rusted areas with S-100 Corrosion Protectant. It will absolutely stop the rust from forming in the future. Been using it on bikes, trucks, cars, and boat engines for years. Amazing results. S100 Corrosion Protectant
It's interesting that the parts around it look pristine. I don't know what those particular parts are made out of but some materials are intended to form a surface oxidation layer to protect themselves. Those could also be made of cheap crap, hard to tell.
That's what confused me, how could a few of the parts be so covered and everything around it look like it just came off the factory floor.