As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FUMES / MUSTY SMELL N THE CABIN NEAR SEAT ROWS 5, 6 AND 7 OCCURED DURING DESCENT. MAINTENANCE FOUND THE APU STARTER LEAKING OIL AND REPLACED IT PER AMM 49-42-51. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.