Final answer:
During a vehicle inspection, if a non-critical defect is found, note the defect and monitor it, ensuring it doesn't worsen, and inform your supervisor.
Step-by-step explanation:
If during your pre-trip inspection, you discover a defect that does not affect the safe operation of the vehicle, the correct action to take is to make a note of the defect but you may wait to do repairs. This is assuming the defect is not critical and does not pose an immediate threat to the safety of the vehicle's operation. However, it's important to monitor the defect to ensure that it doesn't worsen over time. Additionally, it is also a good practice to inform your supervisor or fleet manager about the defect, especially if you are unsure about the severity of the issue.