1. A fault diagnosis system comprising: a fault detection system for taking in a plurality of sensor readings from a gas turbine engine; said plurality of sensors providing readings to a fault isolation system, said fault isolation system predicting a current fault based upon said readings, and to a network communicating with a database of prior predictions, and the database associating the prior predictions with a confidence level for the current prediction; and said fault isolation system providing the predicted current fault to an output, and the confidence level in the current prediction also being provided to the output.