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To close out this problem ---
I called Rick Cox, at Cox Airparts in Wichita - 316-945-0737, and described the symptoms to him. He immediately said to check the nitrogen charge in the accumulator. If there was no pre-charge, to pull the Schrader valve and stick the end of a zip-tie in to see if it was wet. It was.
My IA ordered the O-rings to overhaul the accumulator (Rick has parts too), and now all is well.
In retrospect, the TINY bubbles entrained in the hydraulic fluid should have been my clue that nitrogen was in the system (think Guinness, Nitro Coffee, and the bends while diving). There's only one source of nitrogen in the hydraulic system ... and that's the accumulator.
Rick Cox has certainly earned any future hydraulic business I might have!
Rick
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N337K-FT337GP
KLOU
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