What was found
WITH ENGINE STARTED ON TAXI-OUT FLT ATTENDANT REPORTED "WET LAUNDRY SMELL" IN AFT FUSELAGE AND AFT GALLEY. SMELL DISSIPATED AFTER ABOUT 2 MINUTES. CALLED ATL RADIO AND MCC ADVISED WE RETURN TO GATE. C/W WORK CARD 0550-6001 ENG SOURCE SMOKE AND OIL FUMES. NO DEFECTS FOUND DURING BOROSCOPE OF LPC & HPC. DECONTAMINATION REQUIRED. C/W WORKCARD 0550- 2003. NO CONTAMINATION FOUND DURING DECONTAMINATION. WHILE PERFORMING IDLE ENG RUN WITH LT ENG BLEED OR APU BLEED PER A220 AMP 71-00, NO ODOR WAS PRESENT. C/W NO-GO ODI PREVENTION ATA 2172. (LP# 5002258)