The press is equipped with a Variable Speed Drive delivering multiple data types while the press is at work (speed, torque, current, etc…). Moreover, a measure of quality is available through systematic inspection following each batch of production. These data are used by DiagFit to provide a Software Sensor of the output quality based on the VSD. Then DiagFit analyzes the deviation of features used in deriving the quality’s virtual sensor to predict the type of maintenance to apply to bring the quality back to its optimum level. Resulting prescriptive maintenance recommendations assume that history of maintenance operations is recorded and transmitted for data driven modeling.