What was found
NR 2 ENGINE FIRE DETECTOR SHORT CIRCUIT LIGHT CAME ON (LOOP "A") DURING TAXI, OK ON LOOP "B". DEFERRED PER MEL 26-2-3, CONTROL 12777. REF. DMI 12777 - NR 2 ENGINE FIRE DEFECT SHORT CIRCUIT LIGHT CAME ON (LOOP "A") DURING TAXI. OK ON LOOP "B". TROUBLESHOT FOUND ENGINE WIRE HARNESS RIDING "A" LOOP CONNECTOR & WIRE ON FORWARD INBOARD SIDE OF NR 2 ENGINE FAN COWL SECTION. ADJUSTED WIRE BUNDLE PER M/M 20-50-0. OPS CHECKED NORMAL. CLEARED DMI 12777. A/C OK FOR SERVICE.