As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ENGINE FIRE TEST THE NR 2 ENGINE FIRE HANDLE WOULD NOT ILLUMINATE. A SYSTEM FAULT LIGHT ON NR 2 ENGINE OVERHEAT DETECTION. ACFT GROUNDED. ENGINE & APU FIRE/OVERHEAT DETECTION MODULE INDICATED NR 2 ENGINE "A" LOOP UPPER FAN DETECTOR FAULT. INSPECTED UPPER FAN LOOP & WIRE TERMINAL CONNECTIONS. NO DEFECTS NOTED. REPLACED NR 2 ENGINE UPPER FAN FIRE DETECTOR ASSY M1757. OPS CHECK NORMAL, REF AMM 26-11-01, FIM 26-10, TASKS 801 & 805 & WDM 26-11-11.