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Single Zone Failure

I have a Radientec manifold with 8 zones. All of the outward-bound pex feels hot and yet one zone isn't working. This happened a week ago, my wife called a pro, who came and said it was an "air bubble" --anyway, the pro fixed it and everything was groovey but now that same zone isn't heating up. I don't want to call sombody everytime this happens. Any ideas on how to get me up and running again? Thanks.
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