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 INDICATES A FAULT DURING ENGINE FIRE TEST. GROUNDED - YES. FOUND #2 ENGINE UPPER FAN B LOOP FAULT. POWERED DOWN SYSTEM REF B737-800 AMM 20-60-99. ACCOMPLISHED OPS CHECK OF FIRE DETECTION SYSTEM IAW AMM 26-11-00. NO HISTORY LAST 10 DAYS. GROUND VERIFICATION CHECK SUCCESSFUL.