Town Car suspension compressor cycles about every minute

I drove the car with the suspension switch off. The was a slight bit lower in rear but not dramaticaally low. Then I removed the air line from the drier. When the compressor cycled on. I heard a click from the air bag area and the car sat all the way down. I then plugged the air line. Which had air coming out of it (which I thought air should be coming from the drier, so obvoiusly there is another pressure line coming off the compressor) back into the drier and the car came back to full height and compressor cycled off. So I need help determining whether the leak is mor likely in the airbags. Or a line from the compressor.