What was found
#2 ENG FIRE LIGHT DOES NOT LIGHT ON TEST. GROUNDED - YES. PERFORMED ENGINE/APU FIRE DETECTION CONTROL MODULE BITE PROCEDURE, B737-800 FIM 26-10 TASK 801, NO FAULTS FOUND. PERFORMED B737-800 FIM 26-10 TASK 805 ENGINE - WIRING HARNESS/FIRE DETECTOR FAULT ISOLATION UP TO STEP F. (4)(C). ALL MEASUREMENTS FOR RESISTANCE CHECKED OK. REMOVED AND REPLACED UPPER FAN FIRE DETECTOR ASSEMBLY ON #2 ENGINE, REF B737-800 AMM 26-11-01/401. PERFORMED ENGINE FIRE DETECTION OPERATIONAL TEST REF AMM 26-11-00-710-801.GROUND VERIFICATION SUCCESSFUL PER FIM 26-10 TASK 805.