[Motor31]

Look at the hydraulic manifold. That's the aluminum block that has the hoses going to and from it. There are some knurled knobs on it. Make sure all of the knurled knobs are screwed all the way counter clockwise (as if unscrewing them) until they stop. That may cure the problem. The knurled knobs are for finger operation only so no wrench or pliers needed.

With the slides out and jacks down make sure the reservoir has enough fluid to be about 1/2 inch above the center line seam of the reservoir.

When operating the slides (jacks down first) run the slide farthest from the pump first then in order to the closest (bedroom). That helps purge air from the lines. Then operate the jacks.