As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ENGINE "A" FIRE LOOP WILL NOT TEST. GROUNDED - YES. BITE CHECK OF THE ENGINE/APU FIRE DETECTION UNIT RESULTED IN A LOWER FAN LOOP A FAULT. PERFORMED A GVI OF THE LOWER FAN ELEMENT AND FOUND LOOSE TERMINAL LUGS. SECURED TERMINAL LUGS PER B737-800 AMM 26-11-01/401. PERFORMED AN OP-TEST OF THE ENGINE FIRE DETECTION SYSTEM PER AMM 26-11-00-710-801. ALL TESTS NORMAL.