What was found
ENGINE NR 1 FIRE DETECTOR LOOP "B" DOES NOT TEST. GROUNDED - YES. REF TSR701798 ACCOMPLISHED FIM 26-10 TASKS 801 AND 805 ENGINE/APU FIRE DETECTION CONTROL MODULE BITE AND B LOOP PROCEDURES AND FOUND NO FAULTS. REMOVED AND REPLACED NR 1 ENGINE M1757 AND M1758 UPPER AND LOWER FAN FIRE DETECTORS PER AMM 26-11-01. REMOVED AND REPLACED NR 1 ENGINE MW0316 FAN HARNESS PER AMM 26-11-01. UPON REMOVAL OF MW0316 FAN HARNESS DISCOVERED THE RING TERMINAL CONNECTION FOR THE UPPER LEFT DETECTOR ATTACHED ONLY BY INSULATION. THIS CONFIRMS THE FAULT. NR 1 ENGINE LOOP SWITCH BACK TO NORMAL. ACCOMPLISHED ENG/APU FIRE DETECTION SYS TEST REF AMM 26-10-00 GROUND VERIFICATION TEST SUCCESSFUL. THIS CLEARS MEL 26-2B.