We know two things about this that seem relevant...
1. "backbreaking" was not the key, despite being comprised of letters in the position that the grid coordinates suggested.
2. there are extra numbers behind the ":" in the number string that we don't currently have a use for.
Maybe finding a use for those numbers will lead to the correct letters needed for the key (which we already have, somehow, so we can probably work from both ends to find the method)...
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