Later posts gave the answer that I was going to mention - on my SOB that we traded I would have all three slide outs creep out about 4 to six inches every Spring. As the weather warmed up the fluid apparently did as well and then the slides would extend, in the order that they extended when we wanted them to. The bedroom, then off-door side and then the door slide. Ended up being the off-door side hydraulic piston had an internal leak. Took them two years to get it fixed -- Lippert stood by their warranty, and afterwards since it was already being worked on since before warranty expired. What made it so difficult is that I had had hydraulic front landing gear installed, by Lippert, about six months before all of this started. They kept thinking it was pressure from the landing gear that was causing it so replace this part, then that part, this strut, both struts, etc. Finally they did find the and for the following six years absolutely no problems.