After accepting the precious stone, Sivi slides quietly ahead to give the north and south doors a once-over. She's being very cautious, though not as thorough as with the doors from the entry chamber.

Spoiler: rolls
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Stealth: (d20+9)[12]
Perception from the doorway to the split (AJ51 to AL51 on the googledoc map): (d20+13)[26]
Perception looking north (d20+13)[27], looking south (d20+13)[20], looking west (d20+13)[21]
All Perception checks are -1 for anything other than traps.