I’m diagnosing fluctuations in power because the customer has been experiencing inconsistent voltage, causing lights to flicker and appliances to run inefficiently. After testing the system, I discovered the issue stemmed from a faulty connection in the main service panel, where loose or corroded wiring was causing intermittent power loss. I’m tightening the connections, inspecting the panel for further issues, and ensuring everything is securely grounded to restore stable and reliable power throughout the home.