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The center and rear hyd leveling legs are connected in tandem ...center leg is Lead and rear is follower. If either of the piston seals on the legs leaks internally it can cause them to creep down...
Also the electric solenoid valve for those two legs could be slightly open causing the slow leak as well as the valve could be sticking.
I’d check the manual shutoff screw in that valve to make sure it’s not backed off a tad...additionally I would do a hyd pump bleed .. system is self bleeding so review the process to accomplish.
There is also a simple process to determine if either of those leveling leg pistons is bypassing.
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