What was found
#2 ENG "A" LOOP FIRE DETECTION INOP "B" LOOP TESTS OK. GROUNDED - YES. C/W ENGINE/APU FIRE DETECTION CONTROL MODULE BITE PROCEDURE REF B737-900 FIM 26-10 TASK 801, FOUND ENGINE 2 - LOOP A - WIRING OPEN OR DETECTOR(S) FAULT, REF FIM 26-10 TASK 805, REMOVED FIRE DETECTION CONTROL MODULE AND PERFORMED RESISTANCE CHECK REF B737-900 WDM 26-11-21, D998 PINS 24-25=3716 OHMS AND 25-2=2350 OHMS. RESISTANCE CHECK BETWEEN EACH FIRE DETECTOR TERMINAL AND GROUND FOR ALL 4 TERMINALS WERE WITHIN LIMITS, FOUND WIRE HARNESS MW0325 CONNECTORS DIRTY CLEANED CONNECTORS AND RECHECKED RESISTANCE AT FIRE DET CONTROL MODULE, NEW VALUES ARE 25-2= 856 OHMS & 25-24=2.48 OHMS. ALL WITHIN LIMITS. BITE CHECK OF DETECTION MODULE PASS. OPS TEST GOOD.