As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE FIRE HANDLE DOES NOT COME ON WITH WITH FAULT LIGHT ON. LOOP A INOPERATIVE & LOOP B OPS NORMAL. ACFT GROUNDED. MOVED NR 1 ENGINE FIRE LOOP SWITCH BACK TO BOTH POSITION. OPS TESTED NORMAL. SHOOK DOWN AND INSPECTED THE LOOPS AND ASSOCIATED WIRING. NO DEFECTS. OPS TESTED NORMAL. REPLACED A BROKEN CLAMP AT UPPER LEFT CORE FIRE DETECTOR AT THE LOOP ASSY, IAW AMM 26-11-00.