As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING NR 1 ENG FIRE TEST E&E BOX DISPLAYS NR 1 ENGINE B LOOP LEFT CORE. GROUNDED - YES. NR 1 ENG B LOOP LEFT CORE ELEMENT RESISTANCE VALUE OUT OF LIMITS REF FIM 26-10/805. REPLACED NR 1 ENGINE LEFT CORE FIRE DETECTOR ASSEMBLY. INSTALLATION TEST PASSES REF AMM 26-11-01/401.