As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4409, CREW REPORTED WHILE CRUISING FL 270 A VERY STRONG ELECTRIC ODOR EMANATED FROM THE VENTS SUPPLIED PACK 1 IN CABIN. AIRCRAFT REMOVED FROM SERVICE. FOUND SOURCE OF ODOR TO BE FAILED LEFT RECIRCULATION FAN. REMOVED AND REPLACED LEFT RECIRCULATION FAN IAW EMB-145 AMM 21-24-01; OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.