My left rear want raise up on my CLS 550 the right rear amd front are working. It raised up the the last two times I started it. I started it yesterday it never raised up but al the other sides are up and fine

Hello, there could be a fault in the left rear components of your air suspension system - electrically, or even a leak. Hands on testing is the only way to figure it out. This is well beyond the scope of a do-it-yourself mechanic, and even online help forum, unfortunately. Here are some shops near you that you could consult: https://repairpal.com/repair-shops/mercedes-benz-repair-and-service-in-arlington-texas