What was found
#1 ENGINE "A" FIRE LOOP INOP. GROUNDED - YES. INSPECTED AND FOUND CORE RIGHT LOWER DETECTOR FAULT ACTIVE ON M279 MODULE. ACCESSED MM1760 AND PERFORMED B737-800 FIM 26-10 TASK 810. RESISTANCE WERE WITHIN LIMITS. CLEANED DETECTOR TERMINAL AND CHECKED LUGS. REINSTALLED LUGS, TIGHTENED AND FAULT WENT AWAY. CHECKED RESISTANCE AT D1002 PIN 25 = 879 OHMS. COMPARED TO B LOOP AT PIN12 = 864 OHMS. NO PREVIOUS HISTORY. RETURNED SYS TO NML AND PERFORMED OPS TEST. ALL CKS NML PER FIM 26-10 TASK 801 AND 26-11-00-710-801. PLACED FIRE LOOP SELECTOR TO NML.