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-SOCK ODOR AT CLIMB POWER SETTINGS. NOT NOTICEABLE AT TAXI OR CRUISE SETTINGS. ACCOMPLISHED JOB CARD 26L00021001.VERIFIED APU AS SOURCE OF ODOR, APU PLACE ON MAINTENANCE REPLACED APU IAW J/C 26L31049003.