What was found
FIRE DET 2 FAIL ILLUMINATED STEADY DURING FLIGHT AT CRUISE ALTITUDE. FIRE DET 2 FAIL LATER FLICKERED ON AND OFF FOR THE REMAINDER OF THE FLIGHT. REMOVED ENGINE NR 2 FIRE DETECTOR RAIL ASSY. FOR LOOP 'B' IAW AMM 26-11-03-4-1. RELEASED FOR SERVICE PER MEL 26-11-01, NR 2 ENG FIRE DETECTION LOOP A INOP. MEL: 26-11-01. INERROGATED CFDS THRU FDCU2, FOUND LOOP A FAULT. LOOP A GR BOX FIRE DET ASSY A. REMOVED FIRE DETECTOR RAIL ASSY IS FOR FOR LOOP B. THIS WRI IS FOR A LOOP "A" FAULT, AND IS ON DEFERRAL. NO PARTS WERE REMOVED.