Final answer:
Do not keep attempting to operate the lift if a vehicle is stuck on it; ensure safety by checking the load-holding device if safe, clear the area, and inform your supervisor.
Step-by-step explanation:
If a vehicle gets stuck on a lift and you can't get it down, you should not keep trying to get the lift to work. This can be dangerous and may cause further damage to the lift or the vehicle. Instead, if it's safe, you should look to see if the lift is supported on the load-holding device. Additionally, it's important to move non-essential people from the service bay to ensure safety. Always inform your supervisor about the situation so they can take appropriate measures to resolve the issue safely.