As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1837 - ON CLIMB-OUT FROM DFW, THE CABIN FILLED WITH WHITE SMOKE AND AN ACRID SMELL. AIR INTERRUPTED AND RETURNED TO DFW. ON DESCENT, THE SMOKE CLEARED AND THE SMELL DECREASED. LANDED DFW WITHOUT INCIDENT. REPLACED AUXILLARY POWER UNIT. REPLACED COALESCER BAGS AND ACOMPLISHED PACK BURNOUT. SYSTEM GROUND CHECK NORMAL OPERATION. (M)