What was found
UPON LANDING AT DFW THE CABIN BEGAN FILLING WITH SMOKE. SHORTLY AFTER THE COCKPIT BEGAN TO FILL WITH SMOKE. THE CREW SHUT DOWN THE APU AND SWAPPED BLEEDS TO THE ENGINES. THEY THEN RECEIVED A SMOKE TOILET EICAS. THEY CONTACTED THE FLIGHT ATTENDANT, AND THE DECISION WAS MADE TO CONTINUE TO GATE. FIRE AND RESCUE WAS DISPATCHED AND MET US AT THE GATE. NO FIRE WAS NOTED. AFTER INSPECTION AND TROUBLESHOOTING IT WAS FOUND THAT THE NO1. AIR CYCLE MACHINE HAD FAILED.