After dealing with a leaking front left leveling jack since shortly after our 30-day warrantee expired I finally located the source of the leak.
First I sprayed soap and water on the jack, let it set for several minutes, then sprayed it off with a blast of water from the hose. I did that three times to make sure all of the hydraulic fluid and road grime had been cleaned off.
The next day when the jack was dry, I sprayed foot powder from an aerosol spray can onto the upper part of the jack in the general area where the hydraulic fluid appeared to be leaking. I sprayed enough to leave a thin white coating of powder on the jack and hydraulic hose connections. Then I leveled the RV.
Within a minute or two I could see a slight darkening of the white powder at the top of the jack, just below the thick metal top cap and a bit of darkening around the hex bolt head at the top of the jack. The hose connections are fine and not leaking.
I called Lippert and was told that they don't sell parts for the leveling jack and jack will have to be replaced at a cost of $553.91
This is very discouraging because the RV was manufactured in 2014, but since we are not the original owners, there is no warrantee on the Lippert systems, or anything else for that matter.