1. An apparatus comprising: an input interface configured to receive multiple input signals, each input signal associated with a respective stage of at least one of: a rotating system and a reciprocating system; a processing unit configured to identify a fault in the rotating system using the input signals, wherein the processing unit is configured to identify the fault by at least one of: generating a pressure-volume diagram from a fusion of the input signals and comparing the pressure-volume diagram to a previous diagram to determine changes in the diagrams; and normalizing the input signals and using the normalized input signals to identify a defect and calculate a confidence level of the defect; and an output interface configured to provide an indicator identifying the fault.