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Rust isn't necessarily a problem. You ought to pull the chainplates and bolts and inspect them. There shouldn't be anything that isn't stainless steel.
Stainless steel crevice corrosion doesn't cause rust stains. Staining comes from the iron that is still in the stainless steel. When EPA rules clamped down on metal processing solutions there was less removal of trace iron from stainless steel products. This iron is what causes rust stains in stainless steel. This is a cosmetic not structural problem.
The way to check for crevice corrosion/cracking issues is to inspect for cracking and do a dye penetrant check. You can should use a maginfying glass for inspection. Radio Shack had a cheap monocular I (think it is 50X) that works well for inspecting for cracks. It's especially handy for checking you other rigging tangs.
The way dye penetrant works is to wipe the area with penetrating oil with red dye in it. Then you wipe it off clean. Afterwards you dust the area with talcum power. If there's cracking, the powder will draw the dye from the cracks to the surface and stain the powder. You can get kits to do this or make up yout own.
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