What was found
DURING PREFLIGHT, FOUND THE NR 2 ENGINE FAIL LIGHT ILLUMINATED OVER THE NR 2 EGT GAUGE AND GAUGE WAS STILL INDICATING TEMP. ACFT GROUNDED. REBOOTED ACFT POWER, THE NR 2 ENGINE FAIL LIGHT EGT TEMP STILL DISPLAYING. PERFORMED FIM 73-05, TASK 805, ENGINE FAIL MESSAGE. ACCOMPLISHED EEC BITE FOUND START SIGNAL DISAGREE 76-31362 CYCLED START LEVERS EGT TEMP WENT OUT. RAN BOTH ENGINES #2 ENGINE EGT TEMP REMAINED ON AFTER SHUT DOWN ENGINE FAIL LIGHT REMAINED EXTINGUISHED. PERF EEC BITE, LEG 0 SHOWS FAULT 76-31362 START SIGNAL DISAGREE CYCLING START LEVERS WILL MAKE EGT TEMP TURN OFF. T/S TO #2 ENGINE START BRAKE ASSEMBLY. PER FIM 76-11 TASK 801 (SIG) FURTHER T/S SUGGEST START SW. REMOVED AND REPLACED #2 START SWITCH PER B737-800 AMM 80-11-00-400-801-F00. TEST OK PER AMM 80-11-00-730-801-F00. AIRCRAFT BACK TO SERVICE.