As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DESCENDING THROUGH 12000 A BURNING PLASTIC SMELL STARTED ON THE FLIGHT DECK. LEVELING AT 10000 FEET THE SMELL WAS IN THE CABIN AND REPORTED BY THE FLIGHT ATTENDANTS. TROUBLESHOT SMOKE ODOR FUMES, PER W/C 08L00021001. FOUND OVENS AS SOURCE OF ODOR, REMOVE AND REPLACED OVENS. PER AMM 25-32-03.