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Hi, welcome to Just Answer. My name is***** are a few possibilities for this problem. Either the air compressor has failed and the rear has lowered and the compressor cannot raise it back up or there is a leak in the rear air springs and the rear has lowered and the compressor cannot raise it back up due to the leak or the valve block that directs the air to the rear air springs has failed. You will need to get the compressor checked to see if it producing at least 12 bar pressure. Next would be to check for leaks in the rear air springs.
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The first thing to check would be the compressor. You have to see if the compressor is working and if it is putting out enough pressure before you move on to the next step. It's unlikely that both rear air springs failed at the same time. It's possible, but highly unlikely.