Question about 1994 Lexus LS 400

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1994 Lexus LS 400 - bad suspension

Suspension is sitting extremely low. Electric air ride suspension, though I cannot figure out if the compressor is out or the struts themself. I'm assuming the compressor, as all 4 struts went bad at the same time, though how can I go about checking this?

Symptoms:
-Usually all four wheels are tucked under the fenders as the car sits so low, though sometimes only three(the front left is the one that varies).
-When they were slowly going out, I would hear a hissing from the suspension after the car was turned off.
-Changing the ride height has no effect.

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