What was found
NR 2 TANK AUX PUMP LIGHT BURNED OUT. SPOILER OUTBD CAUTION LIGHT COMES ON AT 185-190 KTS. MAINTENANCE REMOVED AND REPLACED FCECU AND PERFORMED APPLICABLE OPS TESTS AND FUNCTIONAL TESTS. NO DEFECTS NOTED. REMOVED AND REPLACED NR 2 SPOILER UNLOAD VALVE. PERFORMED APPLICABLE OPS CHECKS. NO DEFECTS NOTED FOR THE NR 2 TANK AUX PUMP LIGHT, MAINTENANCE REPLACED NR 2 TANK AUX PUMP SWITCH LIGHT. NO HELP. REMOVED AND REPLACED ADVISORY CONTROL UNIT IAW Q400 TASK 31-51-06-000-801 AND 31-51-06-400-801. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.