Hydrolic jacks will not lower

I once had a situation where my jacks would not retract (go back up). All indicators were fine, just like yours. After a few fine gents at the campground came to my aid, one of them finally found a loose wire. Had to lay on the ground and look up under the engine to see it. I then remembered that I had recently driven on a bumpy road, so that must have been what did it. My motorhome at the time was a 1997 Fleetwood Flair.

Not sayin' this is your problem, but it wouldn't hurt to look.