One thing to try I know it sounds silly,
But pop the airplane up and down a few times and see if it closes, I've had that issue on 337s and 210s both.
Sometimes it's air trapped in the line, I think. Most the time when it's happened I've done that action and they closed.
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General Sky
Tree top Flying in C336, O2, 337A, P337G with IO-550's
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