As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT ON DESCENT THROUGH 6000 FT, TURNED OFF THE NR 1 PACK. MUSTY ODOR DISSAPATED IMMEDIATELY. PERFORMED TSM 05-50-00-810-831-A. FOUND THE NR 1 PACK CAUSING ODOR. INSPECTED THE APU NO LEAKS NOTED. COMPLIED WITH TSM 05-50-00-810-831-A. PERFORMED OPERATION TEST OF THE NR 1 PACK ON ENGINE BLEED 1, ENGINE BLEED 2, AND APU BLEED. COULD NOT DUPLICATE THE CABIN ODOR. AIRCRAFT OK FOR CONTINUED SERVICE.