As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TURNING ON APU BLEED AND SHUTTING MAIN CABIN AIR, CREW REPORTED A DIRTY SOCK ODOR FROM OVERWING TO COCKPIT. MAINTENANCE TROUBLESHOT AND FOUND APU TO BE THE SOURCE OF THE ODOR DUE TO AN OIL LEAK. PERFORMED HIGH POWER ASSURANCE TEST IAW JC 26L00071014. NO FAULTS OR ODORS NOTED. SUBSEQUENTLY, MAINTENANCE R & R APU TURBINE CAVITY VENT O-RINGS IAW MM 49-91-53 AND WASHED APU INLET. OPS GOOD. NO LEAKS FOUND.