Sounds like a valve body or check valve leaking back...not a loose valve.
They can also behave this way if you have air in the system. Have you checked the hydraulic fluid level lately? You should only check the fluid level with the slides and levelers in or retracted.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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