welcome bro.
i have a 03 4,4i 2 axle air suspension (4 corners). i tackled the air suspension problems before.
this is my advice, first thing, check the ride level sensors, make sure none is broken. if the ride level sensors check out, you likely have a leak in the air bags. the rear ones are easy to replace, by yourself it will take you 45 mins tops, with someone 30 mins. also check the fuses in the trunk and the glove box.
once you rule out the ride level sensors, fuses, and bags. clear the error and your car should pump itself back up. if the pump sounds like a drum, you may need to replace the gaskets on the pump. you can find the gaskets on ebay or amazon for about $15 and instructional videos on youtube.
Good luck.
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