What was found
(CAN) ON TAXI IN, F/A REPORTED THE BACK OF THE CABIN FILLED WITH SMOKE. NO LAV SMOKE DETECTOR ACTIVATION, CREW SAID IT DIDN`T SMELL ELECTRICAL OR LIKE A BURNING PACK SMELL. MAINTENANCE WENT THROUGH THE ACFT AND COULD NOT FIND AND EVIDENCE OF ELECTRICAL ISSUES OR AN ELECTRICAL BURNING SMELL. MAINTENANCE FOUND THE RT PACK UNCONTROLLABLE AND BELIEVES THAT IS THE SOURCE OF THE SMOKE. THE RT PACK WAS DEFERRED.