As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: SMELLY SOCK ODOR WITH APU OR ENGINE RUNNING WHILE ON THE GROUND AS WELL AS DURING CLIMB AND DESCENT. MAINTENANCE REPLACED THE APU PER TASK CARD 26L31049003 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK WITH NO LEAKS OR ODORS NOTED.