As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, REPORTED SMOKE IN CABIN AND DECLARED AN EMERGENCY. FLIGHT DIVERTED. MX DISABLED HEATER AFTER CONFIRMATION OF FAILURE. HEATER WOULD NOT CYCLE OFF HOT. DUCTS AND DEBRIS WERE OVERHEATED. NO BURNED OR EVIDENCE OF CHARRED AREAS.