What was found
FLIGHT ATTENDANT REPORTED TWO INSTANCES OF ELECTRICAL SMELL, (NOT EXHAUST FUMES), ON TAXI OUT. BACK AT GATE, ELECTRICAL ODOR OCCURRED AGAIN WITH MECHANIC CONFIRMING IT. MAINTENANCE REMOVED AND REPLACED ENGINE START RELAY (16HB) AS A PRECAUTION IAW AIRBUS MAINTENANCE MANUAL 73-25-34-710-043. ACCOMPLISHED ENGINE RUN WITH ENGINE BLEED AND APU BLEED ON - INSPECTED AFT GALLEY EQUIPMENT - NO FAULTS NOTED.