As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAINT MELTING PLASTIC ODOR REPORTED BY PASSENGER AND FLIGHT ATTENDANT, RETURNED TO GATE. INSPECTED AIRCRAFT, SUSPECT INVERTERS, MEL'D. PASSENGER IN ROW 9 COMPLAINED OF BURNING ODOR ON DESCENT. THE ODOR BECAME STRONGER AS DESCENT CONTINUED, CONFIRMED BY FLIGHT ATTENDENT. COULD NOT TELL IF ELECTRICAL OR SMOKE. ON FERRY FLIGHT ODOR AGAIN IN CABIN AND FLIGHT DECK. DIVERTED TO RDU. RAN AIRCRAFT, OK WITH BLEEDS OFF, FERRIED TO ORF. REPLACED AIR CYCLE MACHINE.