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Replace the hoses
They are cheap compared to a gear up, and they are likely 40 years old. I just had them all done in mine over the last 2 annuals, and this go around had all the fixed hydraulic lines checked and double checked, as well. In one case found some corrosion on a hydraulic line (on the outside) where it was touching a braided brake hose and also another that was scoring where the adel clamp was bent such that the hydraulic line was chafing against a hole punched in a web. It really is the time to check all those lines very carefully (both hoses and lines) while you have it all open. You can see way more than what the typical annual will reveal with small mirrors and flashlights.
Just my thoughts Herb.
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