As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG #1 FIRE LOOP 'A' WILL NOT TEST. GROUNDED - YES. REF B737-800 FIM 26-10 TASK 801, ENG/APU FIRE/OVHT DETECTION CONTROL MODULE BITE TEST SHOWS ENGINE 1 - LOOP A - FAN UPPER DETECTOR FAULT AND ENGINE 1 - LOOP A - CORE RIGHT DETECTOR FAULT. PER FIM 26-10 TASK 805 AND 26-10 TASK 805, REMOVED AND REPLACED DETECTOR M1757 AND M1760. PERFORMED ENGINE/APU FIRE DETECTION CONTROL MODULE BITE TESTS GOOD W/O FAULTS.