As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANT REPORTED TRANSIENT SLIGHT PLASTIC SMELL THAT WAS DETECTED IN FRONT AND REAR CABIN DURING APPROACH. NO ODOR DETECTED IN FLIGHT DECK. MAINTENANCE CLEANED THE APU COMPARTMENT AND THE APU INLET PER TASK CARD 26L00021002. A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM WAS ACCOMPLISHED PER TASK CARD 26L00021014. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS / SMELL NOTED.