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Steve,
I have not tried the field repair - but my thoughts are like Bill's; the maintenance manual has the steps to do this. Removing it sure seems like a nightmare, but once you take the seats out, drain the fluid and get up under there with some good lighting, it is not that bad.
I have built myself a hydraulic power cart with a regulator and pressure gauge that I use for swinging the gear - if you have something like that it would be fairly straight forward to use something like that to do the testing (may need a few extra hoses, etc.
If that seems like too big a job to pull off - my next step would be to take Rick up on his overhauled unit. The PowerPack is the brains of the landing gear.
Jeff
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