If you've already got the chain plates out... it would make sense to replace them, given that the current ones are 20 years old.
I'd have to agree with Sasha as to question why your surveyor told you to do this—unless there was some serious indications of problems with the chainplates or a known history of problems with them on this specific make of boat, 20 year old chain plates are probably still quite serviceable.
It would also be good to make sure that all the fastener holes for the chainplates, if they go through plywood or cored deck material, are properly potted and sealed against water intrusion.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.