As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIRTY SOCK ODOR AFTER APU BLEED SELECTED. OPENED APU COMPARTMENT, SAW SIGNS OF OIL ON APU AND APU DOOR IAW AMM 49-00. RUN APU AND STILL GETTING ODOR AT HIS TIME. INSPECTED APU ACCESS DOOR AND COMPARTMENT FOUND NO EVIDENCE OF CONTAMINATION. REF MD LOG 1531675 & APU REPLACEMENT ON LOG 1531804. (LP: 8423672) AIRCRAFT WAS GROUNDED.