What was found
ON PUSHBACK AND ENGINE START, F/A'S SMELLED SMOKE IN AFT GALLEY AREA. RETURNED TO GATE FOR MTC. INSPECTED AFT GALLEY, LT & RT A/C BAYS, LT & RT ENGINES, AFT LAV SMOKE DETECTOR. REPLACED RT A/C COALESCER BAG, RAN ENGINES AND PACKS, NO SMELL OR SMOKE NOTED. OK FOR SERVICE.