What was found
REF L/P 60313670 #2 ENG FIRE WARNING B LOOP DOES NOT TEST. GROUNDED - YES. REF FIM 26-10 TASK 805 #2 LOOP TOTAL RESISTANCE IS OUT OF TOLERANCE BETWEEN PINS 12 AND 2 CONNECTOR D998 READING 1.2 KOHMS. READING CHANGE TO 870 OHMS AFTER OPENING COWLS. REF B737-800 WDM 26-11-21, ACCOMPLISH WIRE CHECKS PINS 10 & 12 PIN TO PIN & PIN TO GROUND WITH MEGA OHM METER, NO DEFECTS FOUND. DUE TO INTERMITTENT READING REMOVED AND REPLACED LEFT AND RIGHT CORE FIRE DETECTORS REF B737-800 AMM 26-11-01, OPS TEST PASSED. ENGINE APU FIRE CONTROL PANEL OPS CHECK PASSED REF AMM 26-00-01. M279 CONTROL MODULE OPS TEST PASSED REF AMM 26-10-01, ENGINE FIRE DETECTION TEST PASSED REF AMM 26-10-01.