As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT DURING DESCENT, UNABLE TO ISOLATE. PERFORMED TSM 05-50-00-810-831-A, NO ODOR PRESENT AFTER THE NR 1 & 2 ENGINE IDLE RUN . PERFORMED OPERATIONAL CHECK OF THE NR 1 &2 PACKS WITH APU AND ENGINE BLEED SOURCE. NO ODOR PRESENT. ACFT OK FOR SERVICE.