As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE B LOOP INOPERATIVE. ACFT GROUNDED. PERFORMED A NR 2 ENGINE FIRE LOOP DETAILED INSPECTION. TERMINALS AND CONNECTORS ALL SERVICEABLE. RAN THE NR 2 ENGINE FOR 15 MINUTES, COULD NOT DUPLICATE DEFECT. PERFORMED ENGINE AND APU FIRE DETECTION CONTROL MODULE BITE BEFORE, DURING AND AFTER ENGINE RUN IAW FIM 26-10 TASK 801. NO FAULTS. NO HISTORY 30 DAYS, COULD NOT DUPLICATE FAULT.