As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORTED A DIRTY MUSTY ODOR DURING DESCENT THRU ENGINE SHUTDOWN WITH THE PACKS AND BLEEDS ON. MAINTENANCE FOUND THE APU GEARBOX VENT LINE TO HAVE SIGNIFICANT COKING AND REPLACED IT PER TASK CARD 26L00021002. MAINTENANCE ACCOMPLISHED THE DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM PER TASK CARD 26L00021014 WITH NO LEAKS OR ODORS NOTED.