From Pathfinder #146: Cult of Cinders, which isn't enabled.

Rebuild Collapsed Stairs

ACTION

Requirements Crafting (expert), Specialty Crafting (stonemasonry), or hired stonemason; organized workers

You work to clear rubble and rebuild the stairs connecting citadel floors, requiring a DC 20 Crafting check. Repairing the stairs from the courtyard to the battlement (connecting areas A12 and A22) takes 4 days. Repairing the stairs from the courtyard to the vault (connecting areas A12 and B1) takes 4 days. Digging out the long flight of stairs down to Alseta's Ring (connecting areas B1 and D7) takes 8 days.

Pathfinder #146: Cult of CindersOGL