As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED DUE TO BURNING PLASTIC ODOR IN THE CABIN WHICH DID NOT DISSIPATE. INSPECTED CEILING AND SIDEWALL LIGHTS, DROPPED PSI PANELS IN ODOR AREA. INSPECTED INSIDE OF PSU PANELS FOR DAMAGED WIRING OR DAMAGED PCB. RAN PED POWER ON EXTERNAL POWER AND ENGINES, RAN BOTH PACKS WITH APU AND ENGINES. INSPECTED LEFT AND RIGHT RECIRCULATION FANS. DROPPED CEILING PANELS AT ROW 19-21.