As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, THE CAPTAIN AND FIRST OFFICER NOTICED FUMES SIMILAR TO ELECTRICAL SMOKE OR BURNING PLASTIC. THERE WERE NO WARNINGS OR VISUAL INDICATIONS. THIS SMELL PERSISTED FOR ABOUT THIRTY SECONDS AND WAS NEVER NOTICED IN THE CABIN AREA. AIRCRAFT LANDED SAFELY. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND NO DEFECTS OR EVIDENCE OF SMOKE OR FUMES. AIRCRAFT RETURNED TO SERVICE.