What was found
DFW - FLT 1004 - DURING CLIMB-OUT DFW, SMOKE AND ACIDIC FUMES REPORTED IN CABIN. FIRST REPORTED IN MID CABIN. FUMES CAUSED MILD BURNING SENSATION TO PASSENGERS EYES. AIR INTERRUPTED, RETURNED, AND LANDED DFW WITHOUT INCIDENT. REPLACED LEFT AND RIGHT ACMS HEAT EXCHANGERS AND PERFORMED PACK BURN, FUMES NOTED. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)