As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. SHORTLY AFTER APU START EXPERIENCED A STRONG WET SOCK SMELL. PERFORMED J/C'S 26L00021001, 2600021002, 26L00021004. APU CREW FOUND THE APU TURBINE CAVITY VENT TUBES LEAKING OIL. REPLACED APU TURBINE CAVITY VENT TUBE PACKING PER MM 49-21-04.