[carlos80]

Here are the possibilities on your problem. The way these systems work its almost(not impossible) impossible that the lines themselves are at fault. The valves that control the airflow to the bags(known as solenoids) close when the vehicle is off. So what this means is its either the bags or solenoid o-rings in which case it would backfeed to the lines and then you would have a leak there which would mean you have two leaks. Start with the bags its really easy just spray them with soapy water and you'll see bubbles where ever it is you have the leak. IF you don't feel like doing this yourself I would strongly reccomend taking the vehicle somewhere the compressor was not meant to work this hard and usually what ends up happening is failure. Even a good aftermarket compressor for this system will run at least $200.