What was found
SEA - AIR TURN BACK OF FLT 491 - CREW REPORTED ELECTRICAL SMOKE/ODOR IN CABIN. TURNED OFF GALLEY POWER AND RETURNED TO SEA, SMOKE/ODOR DISSIPATED DURING RETURN. INSPECTED GALLEYS AND COMPONENTS, INTERIOR LIGHTS AND BALLASTS, AND E/E COMPT, NO DEFECT NOTED. REPLACED LT COOLING TURBINE AND BOTH WATER SEPARATOR COALESCERS. ACCOMPLISHED AIR QUALITY CHECK PER WORK CARD 28525011, NO ODOR OR DEFECT NOTED. (M)