As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT ATTENDANTS REPORTED AN ODOR SIMILAR TO HOT PLASTIC IN THE REAR OF THE AFT CABIN THAT THE APPARENT CAUSE OF HEADACHES FOR SEVERAL PASSENGERS AND FLT ATTENDANTS. AIRCRAFT WAS IN CRUISE. ANTI ICE WAS NOT IN USE. ODOR DID NOT INCREASE WHEN USING ANTI ICE IN DESCENT. OPERATED AIR CONDITION SYSTEM FOR 30 MINS. COULD NOT DUPLICATE ANY SMELL OR ODOR.