As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ODOR FROM UNKNOWN SOURCE IN THE CABIN AND FLIGHT DECK DURING CRUISE AND DECENT. REMOVAL OF ODOR FROM DUCTS IAW AMM 21-00-00-160-801, RIL 84-21-016, FIM 21-20-00 MCN 62172-01,AND 30-21-00-710-801 FOR OPS TEST OF AIR INTAKE ANTI-ICE, AND R & R THE RECICULATION FILTER IAW 21-22-22-000-801/400-801 NO ODORS NOTED, WITH ENGINES RUNNIG AND BLEEDS ON. RETURNED TO SERVICE. COULD NOT DUPLICATE.