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I still haven't found a Circuit diagram showing which, if any, of the suggested mods. were ever factory fitted
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The advice given regarding modification to the rectifier, though sound, isn't necessary in my opinion. Personally I'd fit the new GZ34, bench test it for a few hours, monitoring the HT current and so on, then button it up and give it back.
I can attest that Marshall's (and indeed other brands) do occasionally pop their mains transformers, but this is the exception rather than the rule in my experience. I know some on here will say better safe than sorry, but on the other hand manufactures also know a thing or two about design and if they dont deem a change necessary then I'd go with that in most cases