Just the obvious maintenance checks is all that comes to mind. Is the reservoir full and have you changed the power steering filter? The service interval for my PS filter is 600 hours.
I don't know if this would help or not, but if it were mine I would jack up the front end so the wheels are off the ground (if you have a FEL, it should be able to lift the front) and run the wheel back and forth. Maybe even try to grab a front tire and turn it side to side.