As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER INFORMED FLIGHT CREW OF SMOKE IN AREA AT LT REAR CABIN BY DIVAN SEAT AND NOTED CARPET APPEARED TO BE MELTED. AIRCRAFT DIVERTED TO LAS VEGAS AS EMERGENCY LANDING. MAINTENANCE DISCOVERED DEFECTIVE GASKET AT EXIT DUCT THAT ROUTES BLEED AIR TO LT WING. PART REPLACED AND RETURNED TO SERVICE. (X)