What was found
DURING TAXI OUT, FLIGHT ATTENDANT AND PASSENGER SMELLED BURNING IN VICINITY OF DOOR 3 AISLE. RETURNED TO GATE WITHOUT INCIDENT. INSPECTED FORWARD CARGO COMPARTMENT, GALLEYS, LAVS, CABIN, SEATBOXES, WIRE BUNDLES, CALL LIGHTS, READING LIGHTS, SIDEWALL, CEILING LIGHTS, ALL ZONE VIDEO PROJECTORS, AND LEFT WHEEL WELL. REPLACED COALESCER WATER SEPARATORS FOR ALL 3 PACKS. ALL SYSTEMS OPERATIONAL CHECK NORMAL.