What was found
PHX - ABORTED T/O - FLT 0317 - C - WHILE PREPARING TO TAKEOFF FROM PHX EN ROUTE TO CMH WHEN THROTTLE WERE ADVANCED FLIGHT CREW RECEIVED A NR 1 ENGINE FIRE LOOP-A FAULT. TAKEOFF WAS ABORTED AND AIRCRAFT RETURNED TO THE GATE. MAINTENANCE TROUBLESHOT AND FOUND CORE LOOP-A HARNESS CHAFED ALMOST ALL THE WAY THROUGH IN TWO PLACES APPROXIMATELY 6 INCHES FROM HIGH PRESSURE BLEED VALVE. REMOVED AND REPLACED CORE LOOP-A HARNESS IAW AMM 26-12-17-401, OPERATIONAL TEST WAS GOOD.