LEVEL CONTROL PUMP AND TRUNK MODULE on 2005 Cadillac DeVille

GOT REPLACEMENT PARTS. SHOULD I REPLACE COMPRESSER FIESR, THEN POWERUPHANKS AND SEE IF EXISTING AIR RIDER MODULE IS OK, OR JUST CHANG IT OUT FIRST. IF EITHOR OR ONE UNIT IS OK, CAN I DAMAGE THE OTHER BY NOT REPLACING BOTH @ SAME TIME? THANKS FOR YOUR RESPONSES!

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1 answer
I would replace module first