Glenn you should have 6 in the rear, and 6 in the front, right? In the rear 2 are for ride height, 2 are for lowering while in leveling mode, and 2 are for raising in leveling mode, so you may have a leak in one, or more of those leveling solenoids. Unless it appears any of them have been replaced, they may be originals, which means they may be 29 years old. I am in the process of replacing all six of mine.
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