Proceed with investigation. Check for any stinky vibes or symbols of chaos in Indaria's quarters, as well as the quarters of the other high officers and their persons, and Marco.
Can't be too careful -I-
You don't detect any psyonic signature or find anything strange with your eldar eyes in Indaria's room. Well, at least nothing strange that you didn't expect Indaria to have. Indaria was a fairly strange person as far as the Imperium was concerned. Not that was a particularly bad thing - at least until the end there.
Your own room is filled with heresy. The "fear the xeno" kind of heresy that Marco probably already knows about, but you should probably keep that in mind if you have guests over.
Marco's room is, thankfully, clean of heretical objects. At least as far as you can tell. Of course this is his ship and he could hide his things wherever he wanted, but he could also just shoot you if you found anything incriminating.
Ruorí's room is also lacking in objects filled with dark power.
Lesser officers arn't important to get their own room in the officer's quarters and instead live in the Voidsmen's quarters, which are currently infested with Zombies and thus presumably filled with heresy. You are free to execute them all for this offense if you desire.
Examining the persons is made difficult by the fact that they are scattered throughout the ship, and you don't have an abundance of free time given you're needed to steer the vessel properly. You are free to continue the investigation now, but your navigation might suffer as a result.
((You are free to detail your rooms however you want. If for some reason you
want to have heresy in your room it doesn't matter, Kedia rolled
abysmally for every search.))