As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON THE GOURND, AFTER 5 MIN OF APU RUNNING, DIRTY SOCK ODOR/SMELL PRESENT AFTER SELECTING APU BLEED ON. SMELL SEEMS TO DISSAPATE AFTER SELECTING BLEED OFF. PERFORMED SMOKE AND FUME T/S IAW A320 AMDS WORKCARD # 0550-2002. FOUND SOURCE TO BE APU INLET DUCT CONTAMINATION. PERFORMED APU DUCT DECONTAMINATION IAW AMM 36-10. NO ODOR PRESENT. OK FOR SVC. (LP: 7404140)