troubleshooter

详细解释:n. 故障检修工, 解决麻烦的能手
【法】 解决纠纷者, 调解人, 解决麻烦问题的能手

英语解释：

名词 troubleshooter:

a worker whose job is to locate and fix sources of trouble (especially in mechanical devices)同义词：trouble shooter