Instead of
"Said Onmyōji are to also inspect RPC-?-1 on a weekly basis and note down any developments to its existing damage."
I'd go with "The aforementioned Onmyōji are to also inspect RPC-?-1 on a weekly basis and note down any developments to its existing damage."
"Past the cave opening leading into RPC-?, geological analysis of the cavern walls reveal partially melted and reformed stone, aged magma formations and obsidian formations dated to have been created roughly two thousand years ago." I'd change to:
"Beyond the cavern's entrance, geological analysis of the cavern walls reveal partially melted and reformed stone, aged magma formations and obsidian formations dated to have been created roughly two thousand years ago."
For the surviving clan member's interview
I would reccomend against ALL CAPS, though I'm sure you've heard me bitch about this a lot by now. I'd go for bold text or italics instead.