As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APU START A MODERATE DIRTY SOX SMELL. DURING ENGINE START & TAXI THE SMELL CONTINUED. DURING CLIMB & CRUISE ODOR CONTINUED AT A MODERATE LEVELS. ODOR WAS REPORTED IN CABIN AS WELL. BOTH CAPT & F/O USED O2 DURING FLIGHT. CORRECTIVE ACTION: FOUND OIL LEAKING FROM COOLING FAN TRANSFER TUBE AND ONTO AND PAST AIR INTAKE DIFFUSER. REPLACED APU COOLING FAN, IAW A319 AMM 49-52. ALSO REPLACED TRANSFER TUBE O-RINGS.