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Damaged or worn air lines are a concern when:

  1. There is an obvious leak

  2. From the moment they are noticed

  3. They produce noise

  4. They are visually unappealing

The correct answer is: From the moment they are noticed

Air lines should be replaced as soon as they are noticed because damaged or worn air lines can lead to safety hazards. An obvious leak (A) may not be present in the early stages of damage and therefore should not be the sole determining factor. Noise production (C) is not the primary concern when it comes to air line maintenance. Visually unappealing (D) air lines may or may not indicate a problem; therefore, they should not be the main criteria for replacement. The best course of action is to regularly inspect air lines for damage or wear and replace them as soon as they are noticed to prevent potential safety issues.