As Doug stated, they do bleed themselves. Now if you have rear Jacks like mine, you will have the actuator attached to the large cylinder and getting the seals just right and the funky clamps on correctly can be a two person job. Taking the large springs off is relatively easy, putting them back on is a matter of getting the right leverage. I did do the job myself although at first I was going to stop at the factory(Iowa) on a cross country trip to have them repaired...that didn't work out. It did take us a few times of taking the Jack on and off, trying to get new seal's locally at first and then finally getting two rear new/rebuilt actuators. No more leaks and the jacks just need a little fine tuning to keep them straight up and down.
While I agree with Doug about many not wanting to Pay for service on an RV...lets face it, the labor cost alone is much more than most of us want to spend and that's taking for granted that a Tech actually knows what he or she is doing so that your not paying for their trail and error/on the job training!
Case in point, while having a code on my Allison Tran's, I called an authorized service center, there rate for diagnosing the actual issue, 200.00 an hour and the estimate was 5-6 hours, plus the cost of what they thought the problem might be, so roughly 2000.-2400.00. Through my own trial and error, No cost and about 100.00 in parts.
