Where a firm learns, from complaints, its own monitoring or anywhere else, that its acts or omissions caused retail customers foreseeable harm, acting in good faith requires it to take appropriate action to put things right. The duty does not bite where the harm flowed from the product's inherent risks and the firm reasonably believed the customers knew and accepted them. PRIN 2A.10 fills in what appropriate action means (see the redress leaf).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.