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Here's an idea to get you started. Put the back end of the car up on ramps so you can crawl underneath it. With the front tires blocked securely, have a helper get into the car and roll down the windows so they can hear you talk from under the car. Have the parking brake set. Take a bucket or container of soapy water and a brush, and / or a spray bottle of soapy water, and crawl under to car. Have the helper start the car, and look and listen for leaks. I have heard the air bags leak on air ride cars after a few years. The soapy water should show a leak when applied to the air bags and the air lines.
It could be either or more. The best bet is to start the car and get it to raise to it's highest level and shut it off. Try to get under it and listen to an air leak. It could be the leveling valve or a line. I would think one of the plastic air lines probably has a hole in it. If you can get the car up on a lift or on ramps, put together a solution of dish soap and water in a spray bottle and spray down all of the air lines, air bags, shocks other componants and look for bubbles. If you can't hear the leak, you'll see the bubbles in the soapy water.
Experienced problem after problem with my suspension on my 1990 LSC. Finally contacted "Strut Masters" online and replaced my entire system with a conversion for less than 400 and an afternoon. Installation was simple.
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