As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 8168, PUJ-JFK. ODOR EVENT NOTICED FROM TOP OF DESCENT. MORE PROMINENT THROUGH 28K FEET. IT SEEMED TO HELP DESCENDING W A/I ON AND USING V/S IE KEEPING POWER LEVELS UP IN DESCENT. MOST PROMINENT MID CABIN. PERFORMED INFO NOTICE 2017-T015F- SECTION B- LEVEL 2 ODOR STEPS 1 TO 3. R & R RECIRC FILTERS (2EX) AS PRECAUTIONARY. NR 1 ENGINE RUN C/W NO OIL LEAK NOTICED, REF L/P 3064962 ITEM 1 FOR FURTHER T/S.