As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - INFLIGHT T368/18 THE CABIN WAS FULL OF SMOKE ON LANDING. INSPECTED APU INLET AND AIRCRAFT TAIL SECTION. FOUND NO OIL OR HYDRAULIC FLUID LEAKS. RAN AIR CONDITIONING PACKS WITH APU AIR AND ENGINE AIR WITH NO SMOKE NOTED. AS PRECAUTIONARY REPLACED WATER SEPARATOR BAGS AND PACK BURN OUT. SYSTEM GROUND CHECKED NORMAL OPERATION.