7000 3 Point

Your lift cylinder is leaking letting the oil bypass and creep down. You will have to put a new oring around it.
Is it leaking while the engine is running or just after you shut it off? I plowed a lot with a 7030 that had a poor friction brake on the lift arm lever in the cab. I don't think any of them will stay up on their own after you shut off the tractor. At least not for an extended period of time. That has been my experience anyway.

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