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Where should you start troubleshooting if a customer complains about door problems on every floor?

  1. The car doors

  2. The control panel

  3. The hoist cables

  4. The motor

The correct answer is: The car doors

Start troubleshooting with the car doors because a customer complaining about door problems on every floor indicates a systemic issue, rather than a floor-specific issue. This suggests that the issue is likely with the car doors and its components, rather than any other system such as the control panel, hoist cables, or motor. Focusing on the car doors will help to efficiently identify and resolve the root cause of the problem.