I would say replacing the diamond wires is not required as long as they are in good shape - give them a through inspection. All the other standing rigging (bridles, shrouds, upper & lower forestay) should be replaced regardless of condition if you don't know their age.
If you replace the diamonds, I would also replace the rotator bolt (which secures the lower end of diamond wires). I had one break a few years ago (during a race of course). You can make it back in without diamond wires, but the mast bends like a twig, you have to take it real easy or you could snap the mast.
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