As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A BURNING ODOR IN CABIN ON APPROACH. ODOR DISSAPATED WHEN CABIN DOOR WAS OPENED AND NO TRACE WAS LEFT WHEN MAINTENANCE GOT TO THE AIRCRAFT. MAINTENANCE RAN THE AIRCRAFT WITH THE ENGINE AND APU AND COULD NOT DUPLICATE THE PROBLEM.