As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT, THE FLT ATTENDANT REPORTED A BURNING PLASTIC ODOR IN THE CABIN. AFTER TURNING OFF ALL CABIN LIGHTING EXCLUDING THE READING LIGHTS, THE ODOR DISSIPATED. THE FLIGHT CONTINUED TO IAH AND LANDED WITHOUT INCIDENT. IN IAH THE SIDEWALL CABIN LIGHTING WAS FOUND TO BE THE SOURCE OF THE ODOR AND WAS DEFERRED AND THE AIRCRAFT DEPARTED WITHOUT INCIDENT. LIGHT SOCKET ASSEMBLY AND LIGHT BULBS WERE REPLACED ABOVE ROWS 15 AND 16 A WITH NO FURTHER DEFECTS NOTED.