What was found
FLIGHT 3847 REPORTED HAVING NR 1 HYDRAULIC CAUTION LIGHT FLICKERING DURING DESCENT INTO SYR. ISOLATION VALVE ACTIVATED. THERE WAS NO DISRUPTION TO HYDRAULIC SYSTEMS REMAINDER OF THE FLIGHT. MAINTENANCE FOUND A NR 6 HYDRAULIC LINE CHAFED THROUGH UNDER PANEL 419AT. DAMAGED LINE WAS REMOVED AND A TEMPORARY FLEX LINE WAS INSTALLED. AIRCRAFT WAS GROUND RUN, ALL SYSTEMS AND LEAK CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE.