What was found
(CAN) DURING TROUBLESHOOTING A DE-ICE SNAG, ( NR 1 ENG DE-ICE BOOT WILL NOT INFLATE ) IT WAS FOUND THAT THE DE-ICE LINE P/N 73010033-147 HAD BEEN CHAFFING ON A HYDRAULIC LINE. THIS LINE IS LOCATED UNDER PANEL 419AT (NR 1 ENG BATMAN PANEL). THE LINE IS HIDDEN UNDER NUMEROUS OTHER LINES AND IT IS VERY DIFFICULT TO SEE / NOTICE THE CHAFFING. WE HAVE CHECK AN OTHER AIRCRAFT AND HAD TO USE A BORESCOPE TO CONFIRM IF THE LINES WERE TOUCHING EACH OTHER. THE LINE WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.SEE ATTACHED PICTURES.