Again I say if you are not happy with your setup get the new one
from SA. It is a clippard valve that is VERY easy to setup. It has an
arm with a hole in it for wire and it works like a light switch. The
robart one will work but for SA this is easier and better.

To check each retract to make sure they are sound just pressurize
each retract separately (it will retract) and then let it off and the
gear will come down. If this checks out fine and you do have any
trouble with the valve--replace it.