I once worked on a QA system for a car manufacturer. The idea was to data mine for commonly ocurring problems and then support a workflow to do root cause analysis and organize a fix in order to reduce warranty expenses.

One problem that had been identified was "Cars of this model produced in this factory have the horn fail very often within the warranty period".

The root cause analysis was: "This factory produces for the Indian market. The horn is designed for 50k activation cycles. Due to the higher use intensity in India, this is not sufficient."

They were still debating whether to install a more sturdy horn only in cars delivered to India or everywhere.