Jumping off Kostos's findings about Berenike's body being the source of her undead anger problem, Ilias and Sidony are taking a closer look at the mummy while the spirit is temporarily housed elsewhere. They'd be dissecting the body as thoroughly as is feasible given they do need to put her back together again afterward.

Specifically, Ilias is looking for irregularities with previous repair work, signs of anything having been done to the body that isn't part of the mummification process as he knows it, or subtler changes to the corpse (discoloration, etc.) that might indicate it's been exposed to something unusual. Would that kind of investigation turn up anything suspicious?