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 INTERMITTENT BURNING PLASTIC SCENT MID CABIN DURING CRUISE - MAINTENANCE FOUND THE APU LEAKING OIL OUT OF THE COMPRESSOR FLANGE AND THE CENTER DRAIN PORT RESULTING IN MAINTENANCE REPLACING THE APU PER JOB CARD 26L31049003