What was found
(CAN) AIRCRAFT WAS ON THE GROUNDAND WHILE BOARDING THE RIGHT PACK TRIP OFF LIGHT ILLUMINATED.THE NORMAL CHECKLIST WAS ACTIONED AND THE PACK TRIP OFF LIGHT WENT OUT. 30 SECONDS LATER THE LEAD F/A CAME IN THE FLIGHT DECK AND REPORTED SMOKE IN THE CABIN. THE RIGHT PACK TRIP OFF LIGHT THEN ILLUMINATED AGAIN. THE SMOKE WAS LIGHT GREY IN COLOR AND SMELLED LIKE A HOT HAIR DRYER. IT DISIPATED SLOWLY AFTER THE RIGHT PACK WAS SELECTED OFF. SYSTEM PLACED ON MEL AND RH ACM WAS LATER REPLACED. *X* (TC# 20190313013)