As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1954 - AFTER TAKEOFF DFW, RETURNED TO DFW DUE TO SMOKE AND BURNING RUBBER SMELL IN CABIN. LANDED DFW OVERWEIGHT WITHOUT INCIDENT. TIGHTENED APU OIL COOLER LINE. ACCOMPLISHED PACK BURN. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)