Hey Jim,
Thanks for your patience whilst I have been on the road for the last two days.
I would have to second Ryan's' advice on looking for a leak. To have good pressure, then not, would suggest that you are loosing fluids. The first places to inspect will be the fittings, both on the actuator and then on the calipers. There are also connections running from the port caliper across the axle to the port side.
Goober says, "Hey!" Andy!! WoooHooo!!