As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HOT PLASTIC SMELL NOTED IN FLIGHTDECK DURING DESCENT, LANDING ,TAXI IN DTW. ARRIVED AT A/C COULD NOT SMELL ANYTHING. RAN PACK'S FULL NOT COULD NOT SMELL ANYTHING JUST THE NEWNESS OF THE A/C COULD NOT DUPLICATE THE SMELL. INSPECTED THE VENT'S COULD NOT SEE ANYTHING.