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A couple suggestions for others that do this job. The tube that connects to the back of the valve can be lifted around the back of the valve cover to give some slack. The valve can be pulled off the bracket to get better access to the fitting. Alternatively the other end of the tube looked to have connectors similar to those on the plenum. If you disconnect that end one could remove the front hose and work on that connector outside the car.
I asked a BMW tech how they deal with these. He mentioned that pushing in on the whole fitting (towards the valve) prior to pushing in the tabs. He also called them 'difficult'.
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