As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: UPON START OF DECENT FROM FL330, BEGAN TO SMELL STRONG ODOR IN CABIN. SAME ODOR THAT IS OFTEN DESCRIBED AS "DIRTY SOCKS". APU WAS NOT RUNNING. ODOR CONTINUE TO BE PRESENT THROUGH ARRIVAL THE GATE. MAINTENANCE FOUND THE APU WAS LEAKING OIL AND REPLACED IT PER TASK CARD 26L31049003. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS NOTED.