What was found
DFW - FLT 3657 - FUMES IN AIRCRAFT BURNS THROAT, EYES, AND LUNGS. GROUND RAN AIRCRAFT FOR 15 MINUTES. NO FUMES NOTED. AIRCRAFT RETURNED TO SERVICE. NOTE: AIRCRAFT HAD PREVIOUSLY BEEN WRITTEN UP ON THIS DAY FOR HOT CABIN/WEAK AIRFLOW. MAINTENANCE REPLACED THE ACM RUBBER ELBOW/DUCTS ON BOTH LEFT AND RIGHT SIDES. THIS MAY HAVE BEEN SOME TYPE OF RESIDUAL OR BURN-OFF. (X)