What was found
FLIGHT DEPARTED LHR WITH LEFT GENERATOR DEFERRED INOPERATIVE. SHORTLY AFTER DEPARTURE, RIGHT GENERATOR FAILED. RETURNED TO LHR. *S/D* THE FAULT ISOLATION CODE INDICATED A DIFFERENTIAL CURRENT FAULT. THE CAUSE WAS A VERY DIRTY CONNECTOR ON THE R-ENGINE CORE/STRUT (D71000P). THIS PREVENTED THE VOLTAGE, FROM THE CURRENT SENSOR IN THE IDG, GETTING TO THE GENERATOR CONTROL UNIT(GCU), AND THE GCU SENSED A PROBLEM AND SHUT DOWN THE IDG. CLEANED THE CONNECTOR. AFTER CLEANING, THE SYSTEM CHECKED GOOD. THIS APPEARS TO BE A ISOLATED DIRTY CONNECTOR PROBLEM.