Power Steering Leak? Not sure how to fix?

I have a 2009 Ford Focus, and one day my power steering got really tight, so I checked and it was low on fluid. So I filled it and a couple days late it was all gone. Then I found it: when I shut the engine off, all the fluid in the reservoir builds up and oozes out the cap. I'm certain I have the cap on all the way, and the o-ring looks to be in good shape. Is there anything I'm not thinking of? What are some remedies?

The reason for the fluid bubbling out is that there's air getting into the system while the engine is running or the air has not been bled out from the first time you refilled it. First off fill it and run the engine turning the wheel all the way left and right a few times. That should get the air out. If it still bubbles out then the only place air can get in is the front seal on the pump, you would need to replace the pump. Do the bleeding first and you must have the car running.

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