What will a class surveyor usually examine in a docking survey?

The shell, including bottom and bow plating, keel, stern, sternframe and rudder; parts of the structure particularly liable to excessive corrosion or deterioration due to chafing or lying aground, and any undue unfairness of bottom plating; clearances in rudder bearings; sea connections and overboard discharge valves and their attachments; propulsion pods; propellers, sternbush and sea connection fastenings; gratings at sea inlets; clearance in the sternbush or efficiency of the oil glands.

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When and why are special surveys of the hull held?

When are docking surveys for class held?