As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DIRTY SOCK SMELL ON DESCENT 15000, ENGINE IDLE ONLY, BOTH PACKS ON, APU OFF CONTINUED UNTIL ENGINE SHUTDOWN. MAINTENANCE FOUND THE APU LUBE UNIT LEAKING OIL AND REPLACED IT PER AMM 49-91-45. A SATISFACTORY LEAK AND OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS NOTED.