What was found
DURING FINE EXTINGUISHER TEST. ENG #2 FIRE HANDLE WILL NOT ILLUMINATE. GROUNDED - YES. PERFORMED ENGINE/APU FIRE DETECTION CONTROL MODULE BITE. SHOWS #2 ENG LOOP A FAULT. PER B737-900 FIM 26-10 TASK 810, EXAMINED TERMINAL LUGS, HARNESSES AND ENG FIRE DETECTORS FOR DAMAGE. PERFORMED RESISTANCE CHECKS ON ENG FAN UPPER AND LOWER LOOP A ELEMENTS AND ENG CORE LEFT AND RIGHT LOOP A ELEMENTS. CHECKS NORMAL. REINSTALLED ALL LOOP A TERMINAL POINTS. REF B737-900 AMM 26-11-01. REMOVED AND REPLACED ENGINE AND APU FIRE DETECTION MODULE. OPS NORMAL. REF AMM 26-10-01/401.