As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE LOOP B FIRE DETECTOR INOPERATIVE. ACFT GROUNDED. PERFORMED ENGINE FIRE DETECTOR BITE CHECK IAW FIM 26-10, TASK 801. FOUND HIGH RESISTANCE OF FIRE DETECTOR LOOP. REPLACED FIRE CORE ELEMENT ASSY IAW MM 26-11-01. OPS CHECKED NORMAL.