What was found
WITH NR 2 ENGINE OVER HEAT DETECTOR SWITCH IN A LOOP POSITION FAULT LIGHT ILLUMINATES INTERMITTENTLY. ACFT GROUNDED. REPLACED THE NR 2 ENGINE FAN FIRE DETECTION HARNESS IAW AMM 26-11-02-000-801, AND REPLACED THE UPPER FAN FIRE DETECTOR IAW AMM 26-11-01-400-802. REMOVED AND REPLACED LOWER FAN FIRE DETECTOR ASSEMBLY, RIGHT CORE FIRE DETECTOR ASSEMBLY, AND LEFT CORE FIRE DETECTOR ASSEMBLY ON NR 2 ENGINE IAW AMM 26-11-01. REMOVED AND REPLACED CORE FIRE DETECTION HARNESS MW0326 IAW AMM 26-11-02. PERFORMED OPS CHECK OF ENGINE FIRE DETECTION SYSTEM, OPS CHECK GOOD IAW AMM 26-11-00.