As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOTICED A OILY SOCK SMELL AFTER TURNING ON APU AND BLEED AIR. REFERENCE ORIG LOG 1835280 FOR REPAIR. REMOVED APU FUEL CONTROL. REMOVED AND REPLACED APU OIL COOLING FAN ASSY O RING ON FAN MOUNTING FLANGE AND 2 NEW O RINGS ON TRANSFER TUBE. REMOVED AND REPLACED APU FUEL CONTROL UNIT.