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So I am posting 3 photos of the part of the transmission that has cracked. You can see the hairline cracks both on the boss and in the threads.
I finally found a core that has gone in to have the internals swapped over and the transmission guy said the "Centre Support" in the core was trashed and I'd have to replace it for around $100 as part of the process. I don't even know what that part is, and so long as this damned thing works at the end of the day I'm happy.