As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ENGINE "B" SIDE FIRE LOOP FAULT. GROUNDED - YES. FOUND UPPER LEFT TERMINAL LUG DAMAGED ON HARNESS MW0316 FOR LOOP B. REMOVED AND REPLACED MW0316 HARNESS REF B737-800 AMM 26-11-02. OPS CHECK GOOD WITH NO FAULTS FOUND REF AMM 26-11-00. GROUND VERIFICATION TEST SUCCESSFUL.