What was found
EN ROUTE IAD-MUC, ON CLIMBOUT, CREW RECEIVED ADVISORY MESSAGE INDICATING LEFT INTEGRATED DRIVE GENERATOR HAD DISCONNECTED. UNABLE TO RESET. AIRCRAFT RETURNED TO IAD DUE TO WEATHER EN ROUTE FORECAST. *S/D* ON THE IDG (INTERGRATED DRIVE GENERATOR), CONNECTOR (P/N: M83723-97S1814N) FAILED. THIS CONNECTOR CARRIES THE CURRENT SENSOR WIRES FOR DIFFERENTIAL PROTECTION. THERE WAS INTERMITTENT ELECTRICAL SHORTING BETWEEN PINS THAT DETERIORATED WITH TIME RESULTING IN A HARD FAILURE. THE CONNECTOR WAS DISASSEMBLED, CLEANED AND ASSEMBLED WITH NEW PINS.