What was found
ON TAXI OUT, AFT FLIGHT ATTENDANTS REPORT ELEC BURNING ODOR IN THE REAR OF THE ACFT. NO ECAM IND OR CIRCUIT BREAKERS TRIPPED. RETURNED TO GATE. ACCOMPLISHED THE CABIN AIR QUALITY TROUBLESHOOTING IAW CARD 26L00021001. RAN ENGS & APU BLEED, ISOLATED PACKS. INSPECTED CEILING ABOVE AFT GALLEY FOR ARCING & CHAFING, NO DEFECTS NOTED. NO ELEC ODORS NOTED. OK FOR SERVICE.