As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENGINE FIRE DETECTION "A" LOOP INOP. GROUNDED - YES. ACCOMPLISHED B737-800 FIM 26-10 TASK 805 AND FOUND TERMINAL LUG ON HARNESS MW0325 THAT CONNECTS TO LOWER RIGHT CORE ELEMENT DETACHED FROM WIRE. RETERMINATED PER B737-800 AMM 26-11-02. ENGINE FIRE DETECTION OP-CHECKS GOOD REF AMM 26-11-00. #2 LOOP SELECTOR PLACED BACK TO NORMAL/MIDDLE. ETOPS GROUND VERIFICATION GOOD.