Mr T........so yer using the weak sister corner test port to power yer FEL. There are several "schemes" to do this. One rigidly ties down yer 3-point lift arms and forces the hydraulic pressure out the corner test port to power up yer FEL. 'nutther scheme uses a lever operated valve to block the hydraulic pressure to yer 3-point lift cylinder. (leaky valve could slightly move yer 3-point lift as you've observed)
Best guess, yer seat top-cover gasket sprung a leak ...or... yer hydraulic lift pipe (you doubt? feel) just inside yer 6"-roundy dipstick plate sprung a leak. (if it leaks, it will SQUIRT across yer tranny housing)
BTW, yer weak sister hydraulic pump is rated at about 2.5gpm and 1700psi and stops pumping every time you clomp yer clod-hoppers on the clutch pedal. The preferred scheme for powering a FEL is the front pulley mounted remote hydraulic pump which is usually rated at 5gpm and 2000psi. As long as yer engine is running, you have hydraulic lift power. Kinda handy when yer backin'n'forwarding ........HTH, Dell
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