troubleshooter
noun
trou·ble·shoot·er
ˈtrə-bəl-ˌshü-tər
1
: a skilled worker employed to locate trouble and make repairs in machinery and technical equipment
2
: an expert in resolving diplomatic or political disputes : a mediator of disputes that are at an impasse
3
: a person skilled at solving or anticipating problems or difficulties
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Merriam-Webster unabridged
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