As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: STRONG DIRTY SOCKS ODOR . INTERMITTENT AND PRIMARY IN CABIN. DIDNOT SMELL IN CRUISE. ACCOMPLISHED J/C'S 26L00021001 AND 26L00021002. VERIFIED APU IS THE SOURCE OF THE ODOR BY INTERNAL TURBINE SEAL LEAK. RAN BOTH ENGINES AND THERE IS NO ODOR FROM EITHER ENGINE. ***SUPPLEMENTAL ACTION SECT 4: REMOVED AND REPLACED APU PER JOB CARD 26L31049003, OPS GOOD***(CLOSED)