[Motorcycle Jack]

Most likely. Have you checked the level in the hydraulic reservoir? Make sure it is at the correct level first. Then to remove the air in the lines you need to run the slides out and in, in order - bedroom slide out then door side then off door side. Run them back in off door, door side then bedroom. once that is done run the offending slide in and out a couple of times. Then go back and do them all in order again. That should remove the air.