As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS NR 2 ENGINE B FIRE LOOP WILL NOT TEST (NO HANDLE LIGHT). ACFT GROUNDED. REPLACED BOTH ENGINE CORE FIRE DETECTOR ASSEMBLY, IAW AMM 26-11-01. INSPECTED AND FOUND UPPER FAN ENGINE FIRE DETECTOR LOOP GROMMETS WORN BEYOND LIMITS. REMOVED AND REPLACED UPPER AND LOWER ENGINE FAN FIRE DETECTOR LOOPS, IAW AMM 26-11-01. PERFORMED OPS CHECK OF FIRE DETECTION SYSTEM, IAW AMM 26-11-00, OPS CHECKED GOOD.