As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT DURING DESCENT IN AFT CABIN "BURNT POPCORN OIL SMELL." SMELL DISSIPATED QUICKLY.-PERFORMED TSM 21-00-00-810-802-A WITH AEROTRACER SNIFFER WITH BOTH ENG 1 + 2 RUNNING CYCLING THROUGH PACK 1 + 2 FOUND VALUES WITHIN LIMITS A/C OK FOR SERVICE