As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING SMELL NOTED ON TAKEOFF AND AGAIN ON RETURN TO FIELD. FOUND AFT CARGO EXTRACTION FAN NOISY, HOT AND GENERATING ELECTRIC ODOR. REMOVED AND REPLACED AFT CARGO EXTRACTION FAN (35HN) PER AIRBUS MAINTENANCE MANUAL 21-28-54. OPERATIONAL CHECK GOOD.