As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 576 - ON TAKEOFF DFW, ACRID SMOKE FILLED CABIN. RETURNED TO DFW AND LANDED WITHOUT FURTHER INCIDENT. REPAIRED HYDRAULIC LEAK INTO DISTRIBUTION DUCT. REPLACED RECIRCULATION FAN FILTERS AND PRESSURE REGULATOR ON NR 1 AND NR 2 SYSTEM, AND PNEUMATIC DISTRIBUTION CHECK VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)