What was found
DURING FLIGHT 1027 - MKE-ATW - THE CREW NOTED THAT THE LEFT AC BUS FAILED FOLLOWED BY A LOUD HISSING AND CRACKLING NOISE FOLLOWED BY SEEING AND SMELLING A SMALL AMOUNT OF SMOKE. MAINTENANCE INSPECTED THE A/C AND FOUND THE ANNUNCIATOR RELAY SHORTED. MAINTENANCE DISCONNECTED THE RELAY AND FERRIED THE A/C TO MKE. MAINTENANCE REPLACED THE LEFT AC BUS ANNUNCIATOR CONTROL RELAY, INSPECTED THE WIRING AND FOUND NO FURTHER DEFECTS. (M)