As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - FLT 3121 - DURING CLIMB, THE FLIGHT ATTENDANT REPORTED A SMOKE ODOR IN THE CABIN. NO VISIBLE SMOKE NOTED. CREW ELECTED TO RETURN TO LAX AND DECLARED EMERGENCY. MAINTENANCE FOUND THE CAUSE TO BE THE NR 1 WINDSHIELD HEAT CONTROLLER TERMINALS WERE BURNED. THE CONTROLLER AND THE TERMINALS WERE REPLACED IAW EMB MM. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)